fix(ci): Update actions/checkout and Fork-Sync-With-Upstream-action versions in sync-upstream workflow

.github/workflows/sync-upstream.yml

@@ -14,11 +14,13 @@ jobs:
     name: Sync latest commits from upstream repo
     runs-on: ubuntu-latest
     if: ${{ github.event.repository.fork }}
+    env:
+      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
 
     steps:
       # Checkout with UPSTREAM_TOKEN (Classic PAT with repo + workflow scope)
       # GITHUB_TOKEN cannot push commits that modify .github/workflows/ files
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: master
           fetch-depth: 0
@@ -33,7 +35,7 @@ jobs:
 
       - name: Sync upstream changes
         id: sync
-        uses: aormsby/Fork-Sync-With-Upstream-action@v3.4
+        uses: aormsby/Fork-Sync-With-Upstream-action@v3.4.3
         with:
           upstream_sync_repo: alexta69/metube
           upstream_sync_branch: master