Bump Microsoft.Extensions.ServiceDiscovery (#1712)

Bumps the dotnet group in /docs/fundamentals/snippets/testing/xunit/AspireApp.ServiceDefaults with 1 update: [Microsoft.Extensions.ServiceDiscovery](https://github.com/dotnet/aspire).


Updates `Microsoft.Extensions.ServiceDiscovery` from 8.2.0 to 8.2.1
- [Release notes](https://github.com/dotnet/aspire/releases)
- [Commits](dotnet/aspire@v8.2.0...v8.2.1)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.ServiceDiscovery
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/fundamentals/snippets/testing/xunit/AspireApp.ServiceDefaults/AspireApp.ServiceDefaults.csproj

@@ -11,7 +11,7 @@
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
 
     <PackageReference Include="Microsoft.Extensions.Http.Resilience" Version="8.9.1" />
-    <PackageReference Include="Microsoft.Extensions.ServiceDiscovery" Version="8.2.0" />
+    <PackageReference Include="Microsoft.Extensions.ServiceDiscovery" Version="8.2.1" />
     <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.9.0" />
     <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.9.0" />
     <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.9.0" />