CI: Use flatpak/flatpak-github-actions

.github/workflows/linux-flatpak-build.yml

@@ -75,7 +75,7 @@ jobs:
       run: flatpak-builder-lint manifest scripts/packaging/flatpak/org.duckstation.DuckStation.yaml
 
     - name: Build Flatpak
-      uses: flathub-infra/flatpak-github-actions/flatpak-builder@9386d85446c0f8c6b93dea3774002af2abcac3d5
+      uses: flatpak/flatpak-github-actions/flatpak-builder@v6
       with:
         bundle: duckstation-${{ matrix.setup.arch }}.flatpak
         upload-artifact: false
@@ -95,7 +95,7 @@ jobs:
 
     - name: Push To Flathub Beta
       if: inputs.flathub_publish && inputs.flathub_branch == 'beta'
-      uses: flathub-infra/flatpak-github-actions/flat-manager@9386d85446c0f8c6b93dea3774002af2abcac3d5
+      uses: flatpak/flatpak-github-actions/flat-manager@v6
       with:
         flat-manager-url: https://hub.flathub.org/
         repository: stable
@@ -104,7 +104,7 @@ jobs:
 
     - name: Push To Flathub Stable
       if: inputs.flathub_publish && inputs.flathub_branch == 'stable'
-      uses: flathub-infra/flatpak-github-actions/flat-manager@9386d85446c0f8c6b93dea3774002af2abcac3d5
+      uses: flatpak/flatpak-github-actions/flat-manager@v6
       with:
         flat-manager-url: https://hub.flathub.org/
         repository: stable