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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     name: Lint and build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v6
         with:
@@ -36,7 +36,7 @@ jobs:
     needs: [lint-and-build]
     if: github.ref == 'refs/heads/main' && github.event_name == 'push'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           # pulls all commits (needed for lerna / semantic release to correctly version)
           fetch-depth: "0"