Update External major dependencies to v3 (master) (major)

[dependency-automation-app]

This PR contains the following updates:

Package	Change	Age	Confidence
org.apache.maven.plugins:maven-release-plugin	2.5 -> 3.3.1
org.apache.maven.plugins:maven-gpg-plugin	1.6 -> 3.2.8
org.apache.maven.plugins:maven-javadoc-plugin	2.9.1 -> 3.12.0
org.apache.maven.plugins:maven-source-plugin	2.2.1 -> 3.4.0

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[simonirwin-r7]

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