Bump actions/checkout from 3 to 4 (#80)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/gradle-build.yml

@@ -13,7 +13,7 @@ jobs:
     name: "Validate Gradle Wrapper"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: gradle/wrapper-validation-action@v1.1.0
   build:
     strategy:
@@ -24,7 +24,7 @@ jobs:
     name: Check on ${{ matrix.os }}
     steps:
     - name: git clone
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Set up JDK 11
       uses: actions/setup-java@v3
       with:

.github/workflows/update-gradle-wrapper.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Update Gradle Wrapper
         uses: gradle-update/update-gradle-wrapper-action@v1