Bump actions/checkout from 2 to 4 (#1154)

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/gardening.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
      - name: Checkout
-       uses: actions/checkout@v3
+       uses: actions/checkout@v4
 
      - name: Setup Node
        uses: actions/setup-node@v3

.github/workflows/phpcs.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:

.github/workflows/phpunit.yml

@@ -26,7 +26,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install subversion
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2