chore(ci): bump checkout action version (#7166)

.github/workflows/sync_repos.yml

@@ -10,41 +10,41 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           token: ${{ secrets.SYNC_PAT }}
-      
+
       - name: Configure git
         run: |
           git config user.name "EdgeTX Sync Bot"
           git config user.email "sync-bot@edgetx.org"
-      
+
       - name: Sync branches from upstream (hard reset)
         env:
           BRANCHES: "main 2.11" # Add/modify branches here as needed
         run: |
           git remote add upstream https://github.com/EdgeTX/edgetx.git
           git fetch upstream
-          
+
           for branch in $BRANCHES; do
             echo "=== Syncing branch: $branch ==="
-            
+
             # Check if upstream has this branch
             if ! git ls-remote --heads upstream | grep -q "refs/heads/$branch"; then
               echo "⚠️  Branch $branch does not exist in upstream, skipping..."
               continue
             fi
-            
+
             # Hard reset to upstream (creates exact copy with same SHA)
             git checkout -B $branch upstream/$branch
-            
+
             # Force push to origin
             git push origin $branch --force
-            
+
             echo "✓ Branch $branch synced (SHA: $(git rev-parse HEAD))"
           done
-          
+
           echo ""
           echo "=== Sync Complete ==="
           echo "All specified branches are now exact copies of upstream"