Add anthropic.com to htmltest ignore list for 403 errors

Co-authored-by: chalin <[email protected]>

Author: Copilot

.htmltest.yml

@@ -57,6 +57,7 @@ IgnoreURLs: # list of regexs of paths or URLs to be ignored
   - ^https://www.youtube.com/playlist\?list= # htmltest doesn't process query parameters
   - ^https://x.com
   - ^https://x.ai
+  - ^https://www.anthropic.com
   - ^https://www.deepseek.com
   - ^https://www.perplexity.ai