Bump Microsoft.Extensions.Configuration.AzureKeyVault

Bumps [Microsoft.Extensions.Configuration.AzureKeyVault](https://github.com/aspnet/Extensions) from 3.1.11 to 3.1.12.
- [Release notes](https://github.com/aspnet/Extensions/releases)
- [Commits](dotnet/extensions@v3.1.11...v3.1.12)

Signed-off-by: dependabot[bot] <support@github.com>

FeatureFlags/FeatureFlags.Service/FeatureFlags.Service.csproj

@@ -15,7 +15,7 @@
     <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.16.0" />
     <PackageReference Include="Microsoft.Azure.Cosmos.Table" Version="1.0.8" />
     <PackageReference Include="Microsoft.Azure.Services.AppAuthentication" Version="1.6.1" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.AzureKeyVault" Version="3.1.11" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.AzureKeyVault" Version="3.1.12" />
     <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="5.0.1" />
   </ItemGroup>