The upcoming Maven 4.0.0 release will switch the default checksum policy from “warn” to “fail”. See MNG-5728.
It will also upgrade Maven Resolver to 1.6.1. See MNG-6996, which lists all the new functionality, such as adding support for SHA-256 and SHA-512 as checksums.
I am not sure when v4.0.0 is due for release but I’m hoping it’s soon.