Bump CommunityToolkit.Maui from 5.3.0 to 6.0.0 in /GraphMAUI

Bumps [CommunityToolkit.Maui](https://github.com/CommunityToolkit/Maui) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/CommunityToolkit/Maui/releases)
- [Commits](CommunityToolkit/Maui@5.3.0...6.0.0)

---
updated-dependencies:
- dependency-name: CommunityToolkit.Maui
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

GraphMAUI/GraphMAUI.csproj

@@ -64,7 +64,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="CommunityToolkit.Maui" Version="5.3.0" />
+        <PackageReference Include="CommunityToolkit.Maui" Version="6.0.0" />
         <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.1" />
         <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="7.0.4" />
         <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />