Link checker can't find remote links on openwrt.org

The link checker (test-links.sh) can't find remote links on openwrt.org and reports them as errors. It leads to warnings in GitLab CI pipelines.

Steps to reproduce

1. Run test-links.sh --remote.
2. Check its output.

Expected results

All available remote links should be reported as 200 OK.

Actual results

Remote links on openwrt.org are reported as unavailable ("Vzdálený soubor neexistuje – slepý odkaz!!!"). The server returns 429 Too Many Requests.