Removed .net 6.0 support.

Author: Mischa Spelt

blazorbootstrap/BlazorBootstrap.csproj

@@ -44,10 +44,6 @@
     <SupportedPlatform Include="browser" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net6.0' ">
-    <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="6.0.29" />
-  </ItemGroup>
-
   <ItemGroup Condition=" '$(TargetFramework)' == 'net8.0' ">
     <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="8.0.8" />
   </ItemGroup>