Bump FluentAssertions from 6.11.0 to 6.12.0 (#1325)

Author: dependabot[bot]

test/TestBuildingBlocks/TestBuildingBlocks.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Bogus" Version="34.0.2" />
     <PackageReference Include="coverlet.collector" Version="$(CoverletVersion)" PrivateAssets="All" />
     <PackageReference Include="GitHubActionsTestLogger" Version="$(GitHubActionsTestLoggerVersion)" PrivateAssets="All" />
-    <PackageReference Include="FluentAssertions" Version="6.11.0" />
+    <PackageReference Include="FluentAssertions" Version="6.12.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="$(AspNetVersion)" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="$(EFCoreVersion)" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="$(TestSdkVersion)" />