Bump actions/checkout from 2 to 4 (#24)

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/build.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Check out repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
     - name: Set up Python 3.8
       uses: actions/setup-python@v1
       with:

.github/workflows/normal.yml

@@ -26,7 +26,7 @@ jobs:
         node-version: latest
 
     - name: Checkout Repo
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Copy .env
       run: php -r "file_exists('.env') || copy('.env.example', '.env');"