Simplify the test_zcu111 action (and test some changes to the runner configuration).
Also, restrict the update_version and wheels actions to PRs into the main branch - sometimes somebody tries to do a PR from main into some other branch, and those actions don't like that.
Simplify the test_zcu111 action (and test some changes to the runner configuration).
Also, restrict the update_version and wheels actions to PRs into the main branch - sometimes somebody tries to do a PR from main into some other branch, and those actions don't like that.