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

Author: renovate[bot]

.github/workflows/pull_request.yml

@@ -7,7 +7,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v6
       - run: pnpm install

.github/workflows/renovate-config-validator.yml

@@ -8,5 +8,5 @@ jobs:
   renovate-config-validator:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: bettermarks/renovate-config/validator@main