Revert "Freeze Python dev"

This reverts commit c685af4.

Author: mroeschke

.github/workflows/unit-tests.yml

@@ -316,8 +316,7 @@ jobs:
     #    To freeze this file, uncomment out the ``if: false`` condition, and migrate the jobs
     #    to the corresponding posix/windows-macos/sdist etc. workflows.
     # Feel free to modify this comment as necessary.
-     # Uncomment below to freeze the workflow, comment it to unfreeze
-    if: false
+    # if: false # Uncomment this to freeze the workflow, comment it to unfreeze
     defaults:
       run:
         shell: bash -eou pipefail {0}