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](https://github.com/actions/checkout/compare/v3...v4)

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

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

.github/workflows/continuous-integration-workflow.yml

@@ -25,7 +25,7 @@ jobs:
         jdk: [17]
       fail-fast: false
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up JDK ${{ matrix.jdk }}
         uses: actions/setup-java@v4
         with:
@@ -53,7 +53,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository == 'spring-projects/spring-session'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up JDK
         uses: actions/setup-java@v4
         with:
@@ -83,7 +83,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository == 'spring-projects/spring-session'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up JDK
         uses: actions/setup-java@v4
         with: