chore(deps): bump actions/checkout from 2 to 4 (#5)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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/release-please.yml

@@ -22,7 +22,7 @@ jobs:
           package-name: ${{ env.ACTION_NAME }}
           extra-files: README.md
           token: ${{ secrets.GITHUB_TOKEN }}
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         if: ${{ steps.release.outputs.release_created }}
       - name: tag major and minor versions
         if: ${{ steps.release.outputs.release_created }}

.github/workflows/test-setup.yaml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup scalingo CLI
         uses: ./
         with:
@@ -44,7 +44,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup scalingo CLI
         uses: ./
         with:
@@ -69,7 +69,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup scalingo CLI
         uses: ./
         with: