chore(deps): bump actions/checkout from 3 to 4 (#237)

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

.github/workflows/CI.yml

@@ -28,7 +28,7 @@ jobs:
       contents: read
     name: Build on ${{ matrix.os }} with Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Validate commit messages

.github/workflows/Regression.yaml

@@ -23,7 +23,7 @@ jobs:
       contents: read
     name: Regression of GDK ${{ matrix.gdk-version == 'HEAD' && '' || matrix.gdk-version }} on ${{ matrix.os }} with Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ matrix.gdk-version == 'HEAD' && github.ref || matrix.gdk-version }}
           fetch-depth: 0
@@ -50,7 +50,7 @@ jobs:
           java-version: 8
           distribution: corretto
       - name: Get Latest UATs
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
           fetch-depth: 0