Prepare 8.4.2 (#6715)

* GH Actions: use latest `pypa/gh-action-pypi-publish`

* Dummy commit

Author: MetRonnie

.github/workflows/2_auto_publish_release.yml

@@ -49,7 +49,7 @@ jobs:
       uses: cylc/release-actions/build-python-package@v1
 
     - name: Publish distribution to PyPI
-      uses: pypa/gh-action-pypi-publish@v1.12.2
+      uses: pypa/gh-action-pypi-publish@release/v1
       with:
         user: __token__ # uses the API token feature of PyPI - least permissions possible
         password: ${{ secrets.PYPI_TOKEN }}

cylc/flow/__init__.py

@@ -13,6 +13,7 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 """Set up the cylc environment."""
 
 import logging