[Docs] Add Huzaifa Sidhpurwala to vuln mgmt team doc (#19808)

Signed-off-by: Russell Bryant <rbryant@redhat.com>

Author: russellb

docs/contributing/vulnerability_management.md

@@ -34,6 +34,7 @@ you may contact the following individuals:
 
 - Simon Mo - simon.mo@hey.com
 - Russell Bryant - rbryant@redhat.com
+- Huzaifa Sidhpurwala - huzaifas@redhat.com
 
 ## Slack Discussion