Bump TUnit.Core from 1.19.57 to 1.21.6 (#415)

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Updated [TUnit.Core](https://github.com/thomhurst/TUnit) from 1.19.57 to
1.21.6.

<details>
<summary>Release notes</summary>

_Sourced from [TUnit.Core's
releases](https://github.com/thomhurst/TUnit/releases)._

## 1.21.6

<!-- Release notes generated using configuration in .github/release.yml
at v1.21.6 -->

## What's Changed
### Other Changes
* perf: replace object locks with Lock type for efficient
synchronization by @​thomhurst in
thomhurst/TUnit#5219
* perf: parallelize test metadata collection for source-generated tests
by @​thomhurst in thomhurst/TUnit#5221
* perf: use GetOrAdd args overload to eliminate closure allocations in
event receivers by @​thomhurst in
thomhurst/TUnit#5222
* perf: self-contained TestEntry<T> with consolidated switch invokers
eliminates per-test JIT by @​thomhurst in
thomhurst/TUnit#5223
### Dependencies
* chore(deps): update tunit to 1.21.0 by @​thomhurst in
thomhurst/TUnit#5220


**Full Changelog**:
thomhurst/TUnit@v1.21.0...v1.21.6

## 1.21.0

<!-- Release notes generated using configuration in .github/release.yml
at v1.21.0 -->

## What's Changed
### Other Changes
* perf: reduce ConcurrentDictionary closure allocations in hot paths by
@​thomhurst in thomhurst/TUnit#5210
* perf: reduce async state machine overhead in test execution pipeline
by @​thomhurst in thomhurst/TUnit#5214
* perf: reduce allocations in EventReceiverOrchestrator and
TestContextExtensions by @​thomhurst in
thomhurst/TUnit#5212
* perf: skip timeout machinery when no timeout configured by @​thomhurst
in thomhurst/TUnit#5211
* perf: reduce allocations and lock contention in ObjectTracker by
@​thomhurst in thomhurst/TUnit#5213
* Feat/numeric tolerance by @​agray in
thomhurst/TUnit#5110
* perf: remove unnecessary lock in ObjectTracker.TrackObjects by
@​thomhurst in thomhurst/TUnit#5217
* perf: eliminate async state machine in
TestCoordinator.ExecuteTestAsync by @​thomhurst in
thomhurst/TUnit#5216
* perf: eliminate LINQ allocation in ObjectTracker.UntrackObjectsAsync
by @​thomhurst in thomhurst/TUnit#5215
* perf: consolidate module initializers into single .cctor via partial
class by @​thomhurst in thomhurst/TUnit#5218
### Dependencies
* chore(deps): update tunit to 1.20.0 by @​thomhurst in
thomhurst/TUnit#5205
* chore(deps): update dependency nunit3testadapter to 6.2.0 by
@​thomhurst in thomhurst/TUnit#5206
* chore(deps): update dependency cliwrap to 3.10.1 by @​thomhurst in
thomhurst/TUnit#5207


**Full Changelog**:
thomhurst/TUnit@v1.20.0...v1.21.0

## 1.20.0

<!-- Release notes generated using configuration in .github/release.yml
at v1.20.0 -->

## What's Changed
### Other Changes
* Fix inverted colors in HTML report ring chart due to locale-dependent
decimal formatting by @​Copilot in
thomhurst/TUnit#5185
* Fix nullable warnings when using Member() on nullable properties by
@​Copilot in thomhurst/TUnit#5191
* Add CS8629 suppression and member access expression matching to
IsNotNullAssertionSuppressor by @​Copilot in
thomhurst/TUnit#5201
* feat: add ConfigureAppHost hook to AspireFixture by @​thomhurst in
thomhurst/TUnit#5202
* Fix ConfigureTestConfiguration being invoked twice by @​thomhurst in
thomhurst/TUnit#5203
* Add IsEquivalentTo assertion for Memory<T> and ReadOnlyMemory<T> by
@​thomhurst in thomhurst/TUnit#5204
### Dependencies
* chore(deps): update dependency gitversion.tool to v6.6.2 by
@​thomhurst in thomhurst/TUnit#5181
* chore(deps): update dependency gitversion.msbuild to 6.6.2 by
@​thomhurst in thomhurst/TUnit#5180
* chore(deps): update tunit to 1.19.74 by @​thomhurst in
thomhurst/TUnit#5179
* chore(deps): update verify to 31.13.3 by @​thomhurst in
thomhurst/TUnit#5182
* chore(deps): update verify to 31.13.5 by @​thomhurst in
thomhurst/TUnit#5183
* chore(deps): update aspire to 13.1.3 by @​thomhurst in
thomhurst/TUnit#5189
* chore(deps): update dependency stackexchange.redis to 2.12.4 by
@​thomhurst in thomhurst/TUnit#5193
* chore(deps): update microsoft/setup-msbuild action to v3 by
@​thomhurst in thomhurst/TUnit#5197


**Full Changelog**:
thomhurst/TUnit@v1.19.74...v1.20.0

## 1.19.74

<!-- Release notes generated using configuration in .github/release.yml
at v1.19.74 -->

## What's Changed
### Other Changes
* feat: per-hook activity spans with method names by @​thomhurst in
thomhurst/TUnit#5159
* fix: add tooltip to truncated span names in HTML report by @​thomhurst
in thomhurst/TUnit#5164
* Use enum names instead of numeric values in test display names by
@​Copilot in thomhurst/TUnit#5178
* fix: resolve CS8920 when mocking interfaces whose members return
static-abstract interfaces by @​lucaxchaves in
thomhurst/TUnit#5154
### Dependencies
* chore(deps): update tunit to 1.19.57 by @​thomhurst in
thomhurst/TUnit#5157
* chore(deps): update dependency gitversion.msbuild to 6.6.1 by
@​thomhurst in thomhurst/TUnit#5160
* chore(deps): update dependency gitversion.tool to v6.6.1 by
@​thomhurst in thomhurst/TUnit#5161
* chore(deps): update dependency polyfill to 9.20.0 by @​thomhurst in
thomhurst/TUnit#5163
* chore(deps): update dependency polyfill to 9.20.0 by @​thomhurst in
thomhurst/TUnit#5162
* chore(deps): update dependency polyfill to 9.21.0 by @​thomhurst in
thomhurst/TUnit#5166
* chore(deps): update dependency polyfill to 9.21.0 by @​thomhurst in
thomhurst/TUnit#5167
* chore(deps): update dependency polyfill to 9.22.0 by @​thomhurst in
thomhurst/TUnit#5168
* chore(deps): update dependency polyfill to 9.22.0 by @​thomhurst in
thomhurst/TUnit#5169
* chore(deps): update dependency coverlet.collector to 8.0.1 by
@​thomhurst in thomhurst/TUnit#5177

## New Contributors
* @​lucaxchaves made their first contribution in
thomhurst/TUnit#5154

**Full Changelog**:
thomhurst/TUnit@v1.19.57...v1.19.74

Commits viewable in [compare
view](thomhurst/TUnit@v1.19.57...v1.21.6).
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Directory.Packages.props

@@ -20,6 +20,6 @@
     <!-- Reference-only packages for test framework namespace resolution in analyzer tests -->
     <PackageVersion Include="xunit.v3.core" Version="3.2.2" />
     <PackageVersion Include="NUnit" Version="4.5.1" />
-    <PackageVersion Include="TUnit.Core" Version="1.19.57" />
+    <PackageVersion Include="TUnit.Core" Version="1.21.6" />
   </ItemGroup>
 </Project>