[ci] 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/cross-maven.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout vitess repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: vitess
       - name: Check if pull request branch exists in debezium main repository
@@ -43,14 +43,14 @@ jobs:
           done < SORTED_PULLS.txt
       - name: Checkout core repository with pull request branch
         if: ${{ steps.branch.outputs.BRANCH_FOUND == 'true' }}
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: ${{ github.event.pull_request.user.login }}/debezium
           ref: ${{ github.head_ref }}
           path: core
       - name: Checkout core repository with default base branch
         if: ${{ steps.branch.outputs.BRANCH_FOUND != 'true' }}
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: debezium/debezium
           ref: ${{ github.base_ref }}

.github/workflows/maven.yml

@@ -20,13 +20,13 @@ jobs:
 
     steps:
       - name: Checkout core repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: debezium/debezium
           ref: ${{ github.ref }}
           path: core
       - name: Checkout Vitess connector
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: vitess
       - name: Set up JDK