It’s a new feature to warn you that some plugin you are using may not work in future. You can make a lot quieter by using the brief mode, though it never goes away completely.
mvn package -Dmaven.plugin.validation=brief
You can set this in the MAVEN_ARGS environment variable and have it picked up everywhere, so apart from a warning “some plugins are out of date” you aren’t distracted
export MAVEN_ARGS="-Dmaven.plugin.validation=brief"