chore(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/gitee-sync.yml

@@ -34,7 +34,7 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Checkout source code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Mirror Github to Gitee
         uses: Yikun/hub-mirror-action@v1.5

.github/workflows/go.yml

@@ -55,7 +55,7 @@ jobs:
           go-version: ${{ env.GO_VERSION }}
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: License Header Check
         run: make verify-copyright
@@ -75,7 +75,7 @@ jobs:
           go-version: ${{ env.GO_VERSION }}
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # This action uses its own setup-go, which always seems to use the latest
       # stable version of Go. We could run 'make lint' to ensure our desired Go

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set ROOT_DIR environment variable
         run: |