add dlqqq@ to Security Council

Author: dlqqq

README.md

@@ -12,6 +12,7 @@ Members
 - Rollin Thomas [@rcthomas](https://github.com/rcthomas)
 - Rick Wagner [@rpwagner](https://github.com/rpwagner)
 - Jason Weill [@jweill-aws](https://github.com/jweill-aws)
+- David L. Qiu [@dlqqq](https://github.com/dlqqq)
 - Joe Lucas [@josephtlucas](https://github.com/josephtlucas)
 
 The Jupyter Security Subproject representative to the [Jupyter Software Steering Council](https://jupyter.org/governance/software_steering_council.html) for 2023 is Rick Wagner ([@rpwagner](https://github.com/rpwagner)).