Fix persistent failing docs link checks

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

docs/source/conf.py

@@ -34,6 +34,7 @@
     "https://api.github.com/graphql",  # Requires auth
     "https://anongit.gentoo.org/git/data/glsa.git",  # Git only link
     "https://www.softwaretestinghelp.com/how-to-write-good-bug-report/",  # Cloudflare protection
+    "https://www.openssl.org/news/vulnerabilities.xml",  # OpenSSL legacy advisory URL, not longer available
 ]
 
 # Add any Sphinx extension module names here, as strings. They can be