Remove use of versioning plugin and update gradle plugins version

[labkey-susanh]

Rationale

• We no longer need to assure ourselves that we are using the intended version of XMLBeans
• A more general task for purging NPM versions from Artifactory helps to keep things tidy
• We can get the Git data we need for the module.xml file without the (dying) versioning plugin

Related Pull Requests

• Remove extra logging, add additional task for removing npm versions and remove use of versioning plugin gradlePlugin#238

Changes

• Add purgeNpmVersions task
• Update gradlePlugins version
• Remove use of versioning plugin