build(deps): bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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/build-and-publish-main.yml

@@ -21,7 +21,7 @@ jobs:
     if: ${{ !contains(github.event.head_commit.message, 'ci skip') }}
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up JDK 11
         uses: actions/setup-java@v4
@@ -66,7 +66,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout main
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Deploy docs
         uses: mhausenblas/[email protected]

.github/workflows/build-pull-request.yml

@@ -11,7 +11,7 @@ jobs:
     if: ${{ !contains(github.event.head_commit.message, 'ci skip') }}
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up JDK 11
         uses: actions/setup-java@v4