chore(deps): update NuGet dependencies

[deniswsrosa]

Summary

• Updates direct NuGet dependencies for the .NET 9 Couchbase Semantic Kernel quickstart to the latest stable versions currently available from nuget.org.
• Supersedes the narrower open Dependabot PRs for CouchbaseNetClient and Microsoft.Extensions packages by updating the same packages to newer current stable releases plus CouchbaseConnector.SemanticKernel.
• Preserves the existing dotnet/NuGet project structure; no package manager or runtime changes.

Updated dependencies

Ecosystem	Dependency	Previous	Updated	Type	Notes
NuGet	CouchbaseConnector.SemanticKernel	0.2.4	0.2.5	direct	Latest stable compatible for net9.0.
NuGet	CouchbaseNetClient	3.8.0	3.9.3	direct	Latest stable compatible for net9.0; supersedes Dependabot PR #2.
NuGet	Microsoft.Extensions.AI.OpenAI	9.9.1-preview.1.25474.6	10.7.0	direct	Moves from the existing preview channel to current stable; supersedes Dependabot PR #9.
NuGet	Microsoft.Extensions.Configuration.EnvironmentVariables	9.0.10	10.0.9	direct	Latest stable compatible for net9.0; supersedes Dependabot PR #10.
NuGet	Microsoft.Extensions.Configuration.UserSecrets	9.0.10	10.0.9	direct	Latest stable compatible for net9.0; supersedes Dependabot PR #11.

Validation

dotnet list CouchbaseSemanticKernelQuickstart.sln package --outdated
dotnet restore
dotnet build --no-restore
dotnet test --no-build
dotnet list CouchbaseSemanticKernelQuickstart.sln package --outdated

Outcomes:

• dotnet list ... --outdated before update showed all five direct packages outdated.
• dotnet restore passed.
• dotnet build --no-restore passed with 5 pre-existing/non-blocking warnings and 0 errors.
• dotnet test --no-build exited 0; this repository has no test project, so no tests were discovered to run.
• dotnet list ... --outdated after update reported: The given project CouchbaseVectorSearchDemo has no updates given the current sources.

Evidence status

Evidence	Status	Notes
Build	passed	Console quickstart builds successfully.
Tests	passed_no_tests	dotnet test --no-build exited 0; no test project is present.
Browser evidence	not_applicable	Repository is a console quickstart, not a web application.
Swagger/OpenAPI evidence	not_applicable	No HTTP/API surface is present.
Runtime smoke test	not_run	dotnet run requires Couchbase/OpenAI credentials per README, so local build validation was used.

Risk notes

• Major-version updates for Microsoft.Extensions packages may include API behavior changes, but local compilation passed without source changes.
• CouchbaseNetClient 3.9.3 emits existing obsolete API warnings for ClusterOptions.UserName and ClusterOptions.Password; they are warnings only and were not introduced as errors by this update.
• No dependencies were skipped: the post-update outdated scan reports no updates available from configured sources.

Rollback

Revert this PR to restore the prior NuGet package versions in CouchbaseVectorSearchDemo/CouchbaseVectorSearchDemo.csproj.

Hermes kanban task: t_26682883

[gemini-code-assist]

Code Review

This pull request updates several NuGet package dependencies in the CouchbaseVectorSearchDemo project to newer versions, including CouchbaseConnector.SemanticKernel, CouchbaseNetClient, Microsoft.Extensions.AI.OpenAI, and Microsoft.Extensions.Configuration packages. There are no review comments, and I have no feedback to provide.

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