Gradle 7.0 removed org.gradle.api.artifacts.maven.MavenDeployer currently used to build AARs.

There's a new Maven Publish Plugin that can be used to output the artifacts to a local destination:
https://docs.gradle.org/current/userguide/publishing_maven.html#publishing_maven:install