chore: update vstest monorepo

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
Microsoft.NET.Test.Sdk	18.6.0 → 18.7.0

---

Release Notes

microsoft/vstest (Microsoft.NET.Test.Sdk)

v18.7.0

What's Changed

• Add ARM64 msdia140.dll support to test platform packages by @​jamesmcroft in #​15689
• Update System.Memory from 4.5.5 to 4.6.3 by @​nohwnd in #​15706

New Contributors

• @​jamesmcroft made their first contribution in #​15689

Full Changelog: microsoft/vstest@v18.6.0...v18.7.0

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • Between 12:00 AM and 03:59 AM (* 0-3 * * *)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

👻 Immortal: This PR will be recreated if closed unmerged. Get config help if that's undesired.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[gemini-code-assist]

Code Review

This pull request updates the Microsoft.NET.Test.Sdk package version from 18.6.0 to 18.7.0 in both the .NET gRPC tests and standard tests project files. There are no review comments, and I have no feedback to provide.