Bump Microsoft.AspNetCore.App

Bumps [Microsoft.AspNetCore.App](https://github.com/aspnet/AspNetCore) from 2.2.0 to 2.2.6.
- [Release notes](https://github.com/aspnet/AspNetCore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@2.2.0...v2.2.6)

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

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

Author: dependabot[bot]

src/Surging.Core/Surging.Core.KestrelHttpServer/Surging.Core.KestrelHttpServer.csproj

@@ -18,7 +18,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.2.0" />
+    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.2.6" />
   </ItemGroup>
 
   <ItemGroup>