fix(server): return -32602 for resource not found (SEP-2164)#2344

pja-ant wants to merge 1 commit intomainmodelcontextprotocol/python-sdk:mainfrom

feat/sep-2164-resource-not-found-error-codemodelcontextprotocol/python-sdk:feat/sep-2164-resource-not-found-error-codeCopy head branch name to clipboard