Try to fix link check rate limiting (#13816)

Author: laurit

.github/workflows/reusable-markdown-link-check.yml

@@ -15,9 +15,12 @@ jobs:
       - uses: lycheeverse/lychee-action@1d97d84f0bc547f7b25f4c2170d87d810dc2fb2c # v2.4.0
         with:
           # excluding links to pull requests and issues is done for performance
+          # stackexchange link fails with 403 when accessed by lychee
           args: >
             --include-fragments
             --exclude "^https://github.com/open-telemetry/opentelemetry-java-instrumentation/(issues|pull)/\\d+$"
             --exclude "^http://code.google.com/p/concurrentlinkedhashmap$"
+            --exclude "^https://softwareengineering.stackexchange.com/questions/29727"
             --max-retries 6
+            --max-concurrency 1
             .