Attempt to reduce 429s on GitHub

Author: urfeex

.github/workflows/check_links.yml

@@ -33,7 +33,7 @@ jobs:
             --exclude '^http://192\.168\.56\.101'
             --exclude 'kernel\.org\/pub\/linux\/kernel'
             --exclude 'releases/download/v\$%7BURCAP_VERSION%7D/externalcontrol-\$%7BURCAP_VERSION%7D\.jar'
-            --threads 1
+            --max-concurrency 1
       - name: Save lychee cache
         uses: actions/cache/save@v4
         if: always()