Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci_cd.yml

@@ -32,7 +32,7 @@ jobs:
     name: Code style
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
@@ -66,7 +66,7 @@ jobs:
 
     steps:
       - name: "Install Git and checkout project"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Set up Python using cache"
         uses: actions/setup-python@v4
@@ -222,7 +222,7 @@ jobs:
     needs: [style, doc-build] #docs-style
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v3
 

.github/workflows/label.yml

@@ -16,7 +16,7 @@ jobs:
     name: Syncer
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: micnncim/action-label-syncer@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}