Add broken link to exclusion list (#55006)

Author: vgrl

src/links/lib/excluded-links.yml

@@ -88,3 +88,4 @@
 - is: https://www.transparency.org/what-is-corruption
 - startsWith: https://platform.openai.com/docs/api-reference/
 - is: https://azuredownloads-g3ahgwb5b8bkbxhd.b01.azurefd.net/github-copilot/
+- is: https://www.anthropic.com/claude/sonnet