Bump Azure.Identity and System.Text.Json

Bumps [Azure.Identity](https://github.com/Azure/azure-sdk-for-net) and [System.Text.Json](https://github.com/dotnet/runtime). These dependencies needed to be updated together.

Updates `Azure.Identity` from 1.12.1 to 1.13.1
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Identity_1.12.1...Azure.Identity_1.13.1)

Updates `System.Text.Json` from 8.0.5 to 6.0.10
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.5...v6.0.10)

---
updated-dependencies:
- dependency-name: Azure.Identity
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

MsGraphSamples.Services/MSGraphSamples.Services.csproj

@@ -9,7 +9,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Azure.Identity" Version="1.12.1" />
+		<PackageReference Include="Azure.Identity" Version="1.13.1" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.1" />
 		<PackageReference Include="Microsoft.Graph" Version="5.60.0" />
 		<PackageReference Include="System.Text.Json" Version="8.0.5" />