Bump MudBlazor from 7.8.0 to 7.15.0

Bumps [MudBlazor](https://github.com/MudBlazor/MudBlazor) from 7.8.0 to 7.15.0.
- [Release notes](https://github.com/MudBlazor/MudBlazor/releases)
- [Changelog](https://github.com/MudBlazor/MudBlazor/blob/dev/CHANGELOG.md)
- [Commits](MudBlazor/MudBlazor@v7.8.0...v7.15.0)

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

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

src/web/Jordnaer/Jordnaer.csproj

@@ -41,7 +41,7 @@
     <PackageReference Include="SixLabors.ImageSharp" Version="3.1.5" />
     <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.8" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.1" />
-    <PackageReference Include="MudBlazor" Version="7.8.0" />
+    <PackageReference Include="MudBlazor" Version="7.15.0" />
     <PackageReference Include="CodeBeam.MudBlazor.Extensions" Version="7.0.2" />
     <PackageReference Include="FluentValidation" Version="11.10.0" />
     <PackageReference Include="Blazored.LocalStorage" Version="4.5.0" />