CI: Update flatpak-github-actions to get upstream improvement

- Bump action dependencies [1]
 - Fix caching from the bump [2]
- Fix build-bundle option [3]

[1]: https://github.com/flatpak/flatpak-github-actions/commit/eacf60ac2fb8ac592088381a7f596e450ac8b899
[2]: https://github.com/flatpak/flatpak-github-actions/commit/1283416d7c0462e052ab0685d9444a7a48bfff3b
[3]: https://github.com/flatpak/flatpak-github-actions/commit/b9a7d065ea8615f8071fdd128b9cf7d45b6bc361

.github/workflows/build-project.yaml

@@ -287,7 +287,7 @@ jobs:
           echo "cacheKey=${cache_key}" >> $GITHUB_OUTPUT
 
       - name: Build Flatpak Manifest 🧾
-        uses: flatpak/flatpak-github-actions/flatpak-builder@v6.1
+        uses: flatpak/flatpak-github-actions/flatpak-builder@1283416d7c0462e052ab0685d9444a7a48bfff3b
         with:
           build-bundle: ${{ fromJSON(needs.check-event.outputs.package) }}
           bundle: obs-studio-flatpak-${{ needs.check-event.outputs.commitHash }}.flatpak

.github/workflows/publish.yaml

@@ -99,7 +99,7 @@ jobs:
           echo "commitHash=${GITHUB_SHA:0:9}" >> $GITHUB_OUTPUT
 
       - name: Build Flatpak Manifest
-        uses: flatpak/flatpak-github-actions/flatpak-builder@v6.1
+        uses: flatpak/flatpak-github-actions/flatpak-builder@1283416d7c0462e052ab0685d9444a7a48bfff3b
         with:
           bundle: obs-studio-${{ steps.setup.outputs.commitHash }}.flatpak
           manifest-path: ${{ github.workspace }}/build-aux/com.obsproject.Studio.json
@@ -127,7 +127,7 @@ jobs:
           ostree commit --repo=repo --canonical-permissions --branch=screenshots/x86_64 flatpak_app/screenshots
 
       - name: Publish to Flathub Beta
-        uses: flatpak/flatpak-github-actions/flat-manager@v6.1
+        uses: flatpak/flatpak-github-actions/flat-manager@1283416d7c0462e052ab0685d9444a7a48bfff3b
         if: ${{ matrix.branch == 'beta' }}
         with:
           flat-manager-url: https://hub.flathub.org/
@@ -135,7 +135,7 @@ jobs:
           token: ${{ secrets.FLATHUB_BETA_TOKEN }}
 
       - name: Publish to Flathub
-        uses: flatpak/flatpak-github-actions/flat-manager@v6.1
+        uses: flatpak/flatpak-github-actions/flat-manager@1283416d7c0462e052ab0685d9444a7a48bfff3b
         if: ${{ matrix.branch == 'stable' }}
         with:
           flat-manager-url: https://hub.flathub.org/