chore: Apply suggestions from code review

Co-authored-by: Xianpeng Shen <xianpeng.shen@gmail.com>

Author: shenxianpeng

.github/workflows/examples/auto-fix.yml

@@ -11,7 +11,7 @@ jobs:
       contents: write  # needed for auto-fix commits
       pull-requests: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
         # For auto-fix commits to trigger new CI runs, use a PAT instead:
         #   with:
         #     token: ${{ secrets.MY_PAT }}

README.md

@@ -78,7 +78,7 @@ When enabled, the action will:
 
 ```yaml
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
       - uses: cpp-linter/cpp-linter-action@v2
         id: linter
         env:

docs/permissions.md

@@ -99,7 +99,7 @@ in addition to any other permissions needed for other features:
     (PAT) with `contents: write` scope:
 
     ```yaml
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v7
       with:
         token: ${{ secrets.MY_PAT }}
     ```