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

Author: renovate[bot]

.github/workflows/playwright.yml

@@ -7,7 +7,7 @@ jobs:
     timeout-minutes: 10
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version: 20