Bump MudBlazor from 6.18.0 to 6.20.0 in /src (#13)

Bumps [MudBlazor](https://github.com/MudBlazor/MudBlazor) from 6.18.0 to 6.20.0.
- [Release notes](https://github.com/MudBlazor/MudBlazor/releases)
- [Changelog](https://github.com/MudBlazor/MudBlazor/blob/dev/CHANGELOG.md)
- [Commits](MudBlazor/MudBlazor@v6.18.0...v6.20.0)

---
updated-dependencies:
- dependency-name: MudBlazor
  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>

Author: dependabot[bot]

src/MudBlazorPages/MudBlazorPages.csproj

@@ -16,7 +16,7 @@
     <PackageReference Include="Blazored.LocalStorage" Version="4.5.0" />
     <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.6" />
     <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="8.0.6" PrivateAssets="all" />
-    <PackageReference Include="MudBlazor" Version="6.18.0" />
+    <PackageReference Include="MudBlazor" Version="6.20.0" />
   </ItemGroup>
 
 </Project>