CI: Remove Flathub push

.github/workflows/rolling-release.yml

@@ -530,15 +530,6 @@ jobs:
       run: |
         flatpak-builder-lint repo repo
 
-    - name: Push To Flathub Stable
-      if: github.ref == 'refs/heads/dev'
-      uses: flathub-infra/flatpak-github-actions/flat-manager@b6c92176b7f578aedd80cac74cd8f0336f618e89
-      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: Upload Flatpak
       uses: actions/upload-artifact@v4.3.3
       with: