chore(deps): update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/checks.yml

@@ -7,7 +7,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
       - uses: openapi-generators/openapi-python-client-action@v2
         with:
           openapi-url: https://raw.githubusercontent.com/openapi-generators/openapi-python-client/main/end_to_end_tests/baseline_openapi_3.0.json