Bump actions/checkout from 2 to 4

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] <support@github.com>

.github/workflows/linter.yml

@@ -47,7 +47,7 @@ jobs:
       # Checkout the code base #
       ##########################
       - name: Checkout Code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # Full git history is needed to get a proper
           # list of changed files within `super-linter`

.github/workflows/php-compatibility-7.4.yaml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: PHP Setup
         uses: shivammathur/setup-php@v2

.github/workflows/php-compatibility-8.0.yaml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: PHP Setup
         uses: shivammathur/setup-php@v2

.github/workflows/php-compatibility-8.2.yaml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: PHP Setup
         uses: shivammathur/setup-php@v2