The latest release for the Maven plugin is only 3.2 with the Artifactory plugin dependency requiring 3.4. - https://github.com/jenkinsci/artifactory-plugin/blob/master/pom.xml#L111

It appears tests have been failing for some time - https://github.com/jfrog/jenkins-artifactory-plugin/actions/workflows/tests.yml

Specific Maven 3+ test failure - https://github.com/jfrog/jenkins-artifactory-plugin/actions/runs/3279842585

Ref: https://plugins.jenkins.io/artifactory/#dependencies

https://plugins.jenkins.io/maven-plugin/#releases