Update Microsoft.JSInterop dependency after Blazor release.

src/WebAssembly.JSInterop/NuGet.config

@@ -2,7 +2,6 @@
 <configuration>
  <packageSources>
     <clear />
-    <add key="blazor" value="https://dotnet.myget.org/f/blazor-dev/api/v3/index.json" />
     <add key="nuget" value="https://api.nuget.org/v3/index.json" />
  </packageSources>
 </configuration>

src/WebAssembly.JSInterop/WebAssembly.JSInterop.csproj

@@ -5,6 +5,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.JSInterop" Version="0.5.0-preview1-10362" />
+    <PackageReference Include="Microsoft.JSInterop" Version="0.5.1" />
   </ItemGroup>
 </Project>