update code of conduct steward (#3496)

Updates code of conduct steward from dabacon to me.

CODE_OF_CONDUCT.md

@@ -69,7 +69,7 @@ dispute. If you are unable to resolve the matter for any reason, or if the
 behavior is threatening or harassing, report it. We are dedicated to providing
 an environment where participants feel welcome and safe.
 
-Reports should be directed to dabacon@google.com, the Project Steward for 
+Reports should be directed to balintp@google.com, the Project Steward for 
 Cirq. It is the Project Steward’s duty to receive and address reported 
 violations of the Code of Conduct. They will then work with a committee 
 consisting of representatives from the Open Source Programs Office and the