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/optaplanner-9.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 

.github/workflows/quarkus-snapshot.yml

@@ -39,13 +39,13 @@ jobs:
           cache-key-prefix: ${{ runner.os }}-${{ matrix.java-version }}-maven${{ matrix.maven-version }}
 
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: current-repo
           ref: main
 
       - name: Checkout Ecosystem
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: ${{ env.ECOSYSTEM_CI_REPO }}
           ref: main

.github/workflows/sonarcloud.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0