Automatic merge from submit-queue

Bump the default etcd version in the Makefile to 3.0.3

Fixes: #29132

I haven't had time to manually validate the arm and arm64 version yet, but I think it should be fine.

cc @xiang90 @hongchaodeng @timothysc @lavalamp @wojtek-t @thockin @kubernetes/sig-scalability @Pensu @laboger