Actions: Update flatpak-github-actions/flatpak-builder to v6.5

Author: ryonakano

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
     - uses: actions/checkout@v4
 
       # Builds your flatpak manifest using the Flatpak Builder action
-    - uses: bilelmoussaoui/flatpak-github-actions/flatpak-builder@v3
+    - uses: flatpak/flatpak-github-actions/flatpak-builder@v6.5
       with:
         # This is the name of the Bundle file we're building and can be anything you like
         bundle: Communique.flatpak