Bump actions/checkout from 6 to 7 (#868)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 

.github/workflows/postcheck.yml

@@ -6,11 +6,11 @@ jobs:
   check-focus:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - run: python .github/check-scripts/check_code_focus.py
 
   check-json:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - run: python .github/check-scripts/check_json.py

.github/workflows/prettier.yml

@@ -15,12 +15,12 @@ jobs:
     steps:
       - name: Checkout
         if: github.event_name == 'push'
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           ref: ${{ github.head_ref }}
       - name: Checkout
         if: github.event_name == 'pull_request'
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 2
       - name: Prettify code