Actions: also update builder to 6.4 (#551)

Author: danirabbit

.github/workflows/publish.yml

@@ -68,7 +68,7 @@ jobs:
           platforms: arm64
 
       - name: Build
-        uses: flatpak/flatpak-github-actions/flatpak-builder@v6.3
+        uses: flatpak/flatpak-github-actions/flatpak-builder@v6.4
         with:
           bundle: ${{ needs.parse.outputs.rdnn }}.flatpak
           manifest-path: ${{ steps.manifest.outputs.manifest }}

.github/workflows/review.yml

@@ -68,7 +68,7 @@ jobs:
           platforms: arm64
 
       - name: Build
-        uses: flatpak/flatpak-github-actions/flatpak-builder@v6
+        uses: flatpak/flatpak-github-actions/flatpak-builder@v6.4
         with:
           bundle: ${{ needs.parse.outputs.rdnn }}.flatpak
           manifest-path: ${{ steps.manifest.outputs.manifest }}