Hi,
We are also facing this issue from last two days. We were not seeing this before. Issue is mysql_user ansible module is failing due to dependency on zlib 1.2.11+ and Centos 7 comes with zlib 1.2.7. Its a reported ansible issue - https://github.com/ansible/ansible/issues/47927.
Also I could see that there was mysql minor version release on 14th oct 5.7.28. Last week when we used the installer we would get mysql 5.7.27 and we dint get above issue.