chore(deps): Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
   lint:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Validate composer.json and composer.lock
         run: composer validate --strict
       - name: Cache Composer packages
@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-24.04
     needs: lint
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Validate composer.json and composer.lock
         run: composer validate --strict
       - name: Cache Composer packages

.github/workflows/release.yml

@@ -7,7 +7,7 @@ jobs:
   bump-version:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: true