chore(deps): bump Microsoft.AspNet.WebApi.Client from 5.2.9 to 6.0.0

Bumps [Microsoft.AspNet.WebApi.Client](https://github.com/aspnet/AspNetWebStack) from 5.2.9 to 6.0.0.
- [Release notes](https://github.com/aspnet/AspNetWebStack/releases)
- [Commits](https://github.com/aspnet/AspNetWebStack/commits)

---
updated-dependencies:
- dependency-name: Microsoft.AspNet.WebApi.Client
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

test/MockHttp.Testing/MockHttp.Testing.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFrameworks>net7.0;net6.0;net5.0;netcoreapp3.1;netcoreapp2.1;net48;net472;net462</TargetFrameworks>
@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.9" />
+    <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="6.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
   </ItemGroup>