PAINTROID-785 upgrade gh actions flutter version

Author: bakicelebi

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
       - uses: actions/checkout@v4.1.4
       - uses: subosito/flutter-action@v2.10.0
         with:
-          flutter-version: "3.27.4"
+          flutter-version: "3.29.2"
           channel: "stable"
           cache-key: "flutter-:os:-:channel:-:version:-:arch:-:hash:"
           cache-path: "${{ runner.tool_cache }}/flutter/:channel:-:version:-:arch:"