Bump Microsoft.Extensions.TimeProvider.Testing in /src

Bumps [Microsoft.Extensions.TimeProvider.Testing](https://github.com/dotnet/extensions) from 9.3.0 to 9.4.0.
- [Release notes](https://github.com/dotnet/extensions/releases)
- [Commits](dotnet/extensions@v9.3.0...v9.4.0)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.TimeProvider.Testing
  dependency-version: 9.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/NServiceBus.Transport.SqlServer.UnitTests/NServiceBus.Transport.SqlServer.UnitTests.csproj

@@ -12,7 +12,7 @@
 
   <ItemGroup>
     <PackageReference Include="GitHubActionsTestLogger" Version="2.4.1" />
-    <PackageReference Include="Microsoft.Extensions.TimeProvider.Testing" Version="9.3.0" />
+    <PackageReference Include="Microsoft.Extensions.TimeProvider.Testing" Version="9.4.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="NUnit" Version="4.3.2" />
     <PackageReference Include="NUnit.Analyzers" Version="4.7.0" />