CI: Re-enable Flathub pushes

The job can just take longer.. can't be arsed to write a separate
workflow at the moment.

.github/workflows/rolling-release.yml

@@ -309,14 +309,14 @@ jobs:
         restore-cache: true
         cache-key: flatpak-x64-${{ hashFiles('scripts/flatpak/**/*.json') }}
 
-#    - name: Push to Flathub stable
-#      if: github.ref == 'refs/heads/dev'
-#      uses: flathub-infra/flatpak-github-actions/flat-manager@23796715b3dfa4c86ddf50cf29c3cc8b3c82dca8
-#      with:
-#        flat-manager-url: https://hub.flathub.org/
-#        repository: stable
-#        token: ${{ secrets.FLATHUB_STABLE_TOKEN }}
-#        build-log-url: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+    - name: Push to Flathub stable
+      if: github.ref == 'refs/heads/dev'
+      uses: flathub-infra/flatpak-github-actions/flat-manager@23796715b3dfa4c86ddf50cf29c3cc8b3c82dca8
+      with:
+        flat-manager-url: https://hub.flathub.org/
+        repository: stable
+        token: ${{ secrets.FLATHUB_STABLE_TOKEN }}
+        build-log-url: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
 
     - name: Validate build
       run: |