Update flatpak CI dependencies

Author: dar5hak

.github/workflows/ci.yml

@@ -17,15 +17,15 @@ jobs:
     runs-on: ubuntu-latest
 
     container:
-      image: ghcr.io/elementary/flatpak-platform/runtime:daily
+      image: ghcr.io/elementary/flatpak-platform/runtime:8
       options: --privileged
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Build
-        uses: bilelmoussaoui/flatpak-github-actions/flatpak-builder@v4
+        uses: flatpak/flatpak-github-actions/flatpak-builder@v6
         with:
           bundle: badger.flatpak
           manifest-path: com.github.elfenware.badger.yml