chore(deps): Bump Radzen.Blazor from 5.7.2 to 6.4.0

Bumps [Radzen.Blazor](https://github.com/radzenhq/radzen-blazor) from 5.7.2 to 6.4.0.
- [Release notes](https://github.com/radzenhq/radzen-blazor/releases)
- [Commits](radzenhq/radzen-blazor@v5.7.2...v6.4.0)

---
updated-dependencies:
- dependency-name: Radzen.Blazor
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Examples/ExampleBlazor/ExampleBlazor.csproj

@@ -9,7 +9,7 @@
     <ItemGroup>
         <ProjectReference Include="..\..\Client.Linq\Client.Linq.csproj" />
         <ProjectReference Include="..\..\Client\Client.csproj" />
-        <PackageReference Include="Radzen.Blazor" Version="5.7.2" />
+        <PackageReference Include="Radzen.Blazor" Version="6.4.0" />
     </ItemGroup>
 
     <ItemGroup>