[cleanup] Misc (#16452)

* Include `pin*` extras in lockfile
* Fix and clean up `devscripts/update_requirements.py`
* Improve release channel documentation
* Remove false statement from `--prefer-insecure` documentation
* Assorted code cleanup
* Set `GH_TELEMETRY=false` in CI/CD whenever `gh` is used
* Add comments about required checks in CI workflows
* Run `test-workflows.yml` for every PR so its checks can be required
* Verify actionlint attestation in CI
* Remove zizmor version to reduce workflow maintenance burden
  (zizmor-action handles pinning on its end)

Authored by: bashonly

yt_dlp/options.py

@@ -1180,7 +1180,7 @@ def create_parser():
     workarounds.add_option(
         '--prefer-insecure', '--prefer-unsecure',
         action='store_true', dest='prefer_insecure',
-        help='Use an unencrypted connection to retrieve information about the video (Currently supported only for YouTube)')
+        help='Use an unencrypted connection to retrieve information about the video')
     workarounds.add_option(
         '--user-agent',
         metavar='UA', dest='user_agent',