Bump Microsoft.Graph in /app-auth/GraphAppOnlyTutorial

Bumps [Microsoft.Graph](https://github.com/microsoftgraph/msgraph-sdk-dotnet) from 5.72.0 to 5.73.0.
- [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@5.72.0...5.73.0)

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

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

Author: dependabot[bot]

app-auth/GraphAppOnlyTutorial/GraphAppOnlyTutorial.csproj

@@ -19,7 +19,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.1" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.1" />
-    <PackageReference Include="Microsoft.Graph" Version="5.72.0" />
+    <PackageReference Include="Microsoft.Graph" Version="5.73.0" />
   </ItemGroup>
 
 </Project>