deps(github): bump actions/checkout from 5 to 6 in /.github/workflows (#2)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/code-style.yaml

@@ -7,7 +7,7 @@ jobs:
   php-cs-fixer:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: shivammathur/setup-php@v2
         with:
           php-version: 8.4
@@ -23,7 +23,7 @@ jobs:
   rector:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: shivammathur/setup-php@v2
         with:
           php-version: 8.4

.github/workflows/phpstan.yaml

@@ -9,7 +9,7 @@ jobs:
   phpstan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: shivammathur/setup-php@v2
         with:
           php-version: 8.4

.github/workflows/phpunit.yaml

@@ -9,7 +9,7 @@ jobs:
   unit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
@@ -43,7 +43,7 @@ jobs:
           --health-timeout 5s
           --health-retries 10
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with: