Bump MudBlazor from 6.14.0 to 6.15.0 in /src

Bumps [MudBlazor](https://github.com/MudBlazor/MudBlazor) from 6.14.0 to 6.15.0.
- [Release notes](https://github.com/MudBlazor/MudBlazor/releases)
- [Changelog](https://github.com/MudBlazor/MudBlazor/blob/dev/CHANGELOG.md)
- [Commits](MudBlazor/MudBlazor@v6.14.0...v6.15.0)

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

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

src/PresenceLight.Razor/PresenceLight.Razor.csproj

@@ -30,7 +30,7 @@
     <PackageReference Include="Microsoft.Identity.Web.MicrosoftGraph" Version="2.16.1" />
     <PackageReference Include="Microsoft.Identity.Web.UI" Version="2.16.1" />
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.19.6" />
-    <PackageReference Include="MudBlazor" Version="6.14.0" />
+    <PackageReference Include="MudBlazor" Version="6.15.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>