Change links to https in README

[304NotModified]

Because we like privacy

[304NotModified]

builds is broken

Testhost process for source(s) 'C:\projects\ahoy\test\Swashbuckle.AspNetCore.ApiTesting.Test\bin\Debug\net6.0\Swashbuckle.AspNetCore.ApiTesting.Test.dll' exited with error: You must install or update .NET to run this application.
App: C:\projects\ahoy\test\Swashbuckle.AspNetCore.ApiTesting.Test\bin\Debug\net6.0\testhost.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '6.0.0' (x64)
.NET location: C:\Users\appveyor\AppData\Local\Microsoft\dotnet\
The following frameworks were found:
  1.0.16 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  1.1.13 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  2.0.9 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  2.1.18 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  2.2.7 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  3.0.3 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  3.1.4 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  3.1.32 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  5.0.17 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  7.0.0 at [C:\Users\appveyor\AppData\Local\Microsoft\dotnet\shared\Microsoft.NETCore.App]
Learn about framework resolution:
https://aka.ms/dotnet/app-launch-failed
To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=6.0.0&arch=x64&rid=win10-x64
. Please check the diagnostic logs for more information.
Test Run Aborted.

[martincostello]

Thanks for contributing - if you'd like to continue with this pull request, please rebase against the default branch to pick up our new CI.

[martincostello]

Cherry-picked to #2808.