housekeeping: fix blazor version

Author: glennawatson

src/ReactiveUI.Blazor/ReactiveUI.Blazor.csproj

@@ -12,7 +12,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard')) ">
-    <PackageReference Include="Microsoft.AspNetCore.Components" Version="5.0.1" />
+    <PackageReference Include="Microsoft.AspNetCore.Components" Version="3.1.10" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net5')) ">