workflows: test-tar: add comment re: api spec

workflows: test-tar: migrate from 3rd party action

Merge tag 'v4.1.0' of https://github.com/cloudflare/cloudflare-python

Merge tag 'v4.0.0' of https://github.com/cloudflare/cloudflare-python

Merge tag 'v3.1.0' of https://github.com/cloudflare/cloudflare-python

Merge tag 'v3.0.1' of https://github.com/cloudflare/cloudflare-python

Merge tag 'v3.0.0-beta.10' of https://github.com/cloudflare/cloudflar…

…e-python

also fetch and include spec in test tar