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

Author: renovate[bot]

.github/workflows/images-to-google-cloud-storage.yml

@@ -15,7 +15,7 @@ jobs:
       run:
         working-directory: images-to-google-cloud-storage
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: shellcheck ./create-cloud-resources.sh
       - run: shellcheck ./delete-cloud-resources.sh
       - run: npx @redocly/openapi-cli lint openapi.yaml

.github/workflows/lint.yml

@@ -9,7 +9,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: github/super-linter/slim@v5