Bump Azure.Identity in /src/FeatureFlags.Service in the service group

Bumps the service group in /src/FeatureFlags.Service with 1 update: [Azure.Identity](https://github.com/Azure/azure-sdk-for-net).


Updates `Azure.Identity` from 1.11.4 to 1.12.0
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Identity_1.11.4...Azure.Identity_1.12.0)

---
updated-dependencies:
- dependency-name: Azure.Identity
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: service
...

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

src/FeatureFlags.Service/FeatureFlags.Service.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="Azure.Data.Tables" Version="12.8.3" />
     <PackageReference Include="Azure.Extensions.AspNetCore.Configuration.Secrets" Version="1.3.1" />
-    <PackageReference Include="Azure.Identity" Version="1.11.4" />
+    <PackageReference Include="Azure.Identity" Version="1.12.0" />
     <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.6.0" />
     <PackageReference Include="Azure.Storage.Blobs" Version="12.20.0" />
     <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.22.0" />