fix: return updated agent_card in JsonRpcTransport.get_card()#552

sokoliva merged 4 commits intoa2aproject:maina2aproject/a2a-python:mainfrom

ShishirRmc:fix/jsonrpc-get-card-return-valueShishirRmc/a2a-python:fix/jsonrpc-get-card-return-valueCopy head branch name to clipboard