Remove unused changelog steps (#185)

This broke somewhere along the way and we weren't using them anyway so
easy cleanup.

.github/workflows/changelog.yml

@@ -28,23 +28,10 @@ jobs:
       - uses: actions/setup-python@v2
         name: Install Python
         with:
-          python-version: '3.9'
+          python-version: '3.12'
 
       - name: Install Dependencies
         run: pip install reno docutils
 
       - name: Lint changelog notes
         run: reno lint
-
-      - name: Generate changelog
-        run: |
-          reno report | tee CHANGELOG.rst
-          rst2html.py CHANGELOG.rst CHANGELOG.html
-
-      - name: Upload CHANGELOG.rst
-        uses: actions/upload-artifact@v2
-        with:
-          name: changelog
-          path: |
-            CHANGELOG.rst
-            CHANGELOG.html