Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/npm-build.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "Setup PHP (for Ziggy)"
         uses: shivammathur/setup-php@v2

.github/workflows/npm-format-check.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "Use Node.js"
         uses: actions/setup-node@v6

.github/workflows/npm-lint.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "Use Node.js"
         uses: actions/setup-node@v6

.github/workflows/npm-typecheck.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "Setup PHP (for Ziggy)"
         uses: shivammathur/setup-php@v2

.github/workflows/phpstan.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "Setup PHP"
         uses: shivammathur/setup-php@v2

.github/workflows/phpunit.yml

@@ -36,7 +36,7 @@ jobs:
           --health-retries 5
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "Setup PHP"
         uses: shivammathur/setup-php@v2

.github/workflows/pint.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "Check code style"
         uses: aglipanci/[email protected]

.github/workflows/playwright.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "Setup node"
         uses: actions/setup-node@v6