build(deps): bump Microsoft.Graph from 5.67.0 to 5.68.0 (#358)

Bumps [Microsoft.Graph](https://github.com/microsoftgraph/msgraph-sdk-dotnet) from 5.67.0 to 5.68.0.
- [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@5.67.0...5.68.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

GraphOrgExample/GraphOrgExample.csproj

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <PackageReference Include="Azure.Identity" Version="1.13.1" />
-    <PackageReference Include="Microsoft.Graph" Version="5.67.0" />
+    <PackageReference Include="Microsoft.Graph" Version="5.68.0" />
     <PackageReference Include="Microsoft.Identity.Client" Version="4.66.2" />
     <PackageReference Include="Microsoft.Identity.Web.MicrosoftGraph" Version="3.5.0" />
     <PackageReference Include="Microsoft.Identity.Web.UI" Version="3.3.1" />