GitHub Actions is deprecating macos-10.5 runner

[rszamszur]

The macos-10.5 runner is currently used for K8s integration, which is deprecated and expected to be removed by the end of August (actions/runner-images#5583).

The reason 10.5 was used is it has Vagrant pre-installed and allowed nested virtualization. This was necessary to boot up the environment for testing generated project make dev-env target, which bootstrap local development minikube cluster exposing generated FastaAPI application. From a quick glance at the original issue (actions/runner-images#5583) it seems that macos-12 runner will have Vagrant and nested virtualization enabled. So technically, the switch would be just updating the runner in the following files:

• https://github.com/rszamszur/fastapi-mvc/blob/8551343f2a292f9768f4095e210b15ff3f398777/.github/workflows/integration.yml#L29 (for all occurrences)
• https://github.com/rszamszur/fastapi-mvc/blob/8551343f2a292f9768f4095e210b15ff3f398777/fastapi_mvc/generators/project/template/%7B%7Bcookiecutter.folder_name%7D%7D/.github/workflows/integration.yml#L29