chore(deps): update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/pages.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - uses: subosito/flutter-action@v2

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     name: Package and Publish
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           token: ${{ secrets.DEPLOY_TOKEN }}
       - uses: subosito/flutter-action@v2

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     name: Linting and Testing
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           submodules: true
       - uses: subosito/flutter-action@v2