Bump Microsoft.Graph from 5.55.0 to 5.60.0 in /src

Bumps [Microsoft.Graph](https://github.com/microsoftgraph/msgraph-sdk-dotnet) from 5.55.0 to 5.60.0.
- [Release notes](https://github.com/microsoftgraph/msgraph-sdk-dotnet/releases)
- [Changelog](https://github.com/microsoftgraph/msgraph-sdk-dotnet/blob/main/CHANGELOG.md)
- [Commits](microsoftgraph/msgraph-sdk-dotnet@v5.55.0...5.60.0)

---
updated-dependencies:
- dependency-name: Microsoft.Graph
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/GitHubConnector.csproj

@@ -30,7 +30,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="8.0.0" />
-    <PackageReference Include="Microsoft.Graph" Version="5.55.0" />
+    <PackageReference Include="Microsoft.Graph" Version="5.60.0" />
     <PackageReference Include="Octokit" Version="9.1.2" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>