Bump actions/checkout from 6 to 7 (#58)

Author: dependabot[bot]

.github/workflows/flutter.yml

@@ -27,7 +27,7 @@ jobs:
       FLUTTER_VERSION: "3.22.1"
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Setup Java
         uses: actions/setup-java@v5
         with:

.github/workflows/publish.yml

@@ -13,7 +13,7 @@ jobs:
       id-token: write # Required for authentication using OIDC
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: Install Flutter
         uses: subosito/flutter-action@v2
       - uses: dart-lang/setup-dart@v1