Add Ken Jin because he involves early design

Author: corona10

Doc/whatsnew/3.14.rst

@@ -326,7 +326,7 @@ With this change, the free-threaded CPython build achieve better performance
 and 10-15% slower than the default build.
 
 This work was done by many contributors, Matt Page, Neil Schemenauer,
-Sam Gross, Thomas Wouters, Donghee Na and Kirill Podoprigora
+Sam Gross, Thomas Wouters, Donghee Na, Kirill Podoprigora and Ken Jin.
 Meta also provided significant engineering resources for performance benchmark and
 design per thread specialized bytecode mechanisms.