fix(examples): Prevent resource leak in simple-auth-client CallbackServer#1348

pankaj-bind wants to merge 2 commits intomodelcontextprotocol:mainmodelcontextprotocol/python-sdk:mainfrom

pankaj-bind:auth-client-resource-leakpankaj-bind/python-sdk:auth-client-resource-leakCopy head branch name to clipboard