Bump Microsoft.AspNetCore.WebSockets from 2.1.1 to 2.1.7 (#2)

Bumps [Microsoft.AspNetCore.WebSockets](https://github.com/aspnet/AspNetCore) from 2.1.1 to 2.1.7.
- [Release notes](https://github.com/aspnet/AspNetCore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](https://github.com/aspnet/AspNetCore/compare/2.1.1...v2.1.7)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.WebSockets
  dependency-type: direct:production
...

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kestrel.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.1.3" />
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Core" Version="2.1.3" />
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv" Version="2.1.3" />
-    <PackageReference Include="Microsoft.AspNetCore.WebSockets" Version="2.1.1" />
+    <PackageReference Include="Microsoft.AspNetCore.WebSockets" Version="2.1.7" />
   </ItemGroup>
 
 </Project>