build(deps): bump actions/checkout from 4 to 6 (#166)

Author: BBarisKilic

.github/workflows/gh-pages.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: subosito/flutter-action@v2
       - uses: bluefireteam/flutter-gh-pages@v9
         with: