Fix build - Githubissues

Update gradle to 6.9.2
Update version: plugin gradle-git-publish 3.0.0 -> 3.0.1
Update build: plugin maven has been renamed: maven -> maven-publish
Update version: library net.jodah:typetools 0.6.2 -> 0.6.3
Update build: adapt docker tasks (see Changelog https://bmuschko.github.io/gradle-docker-plugin/#change_log)
Update test: Force locale into ValidationEndToEndTest.java

Resolve #850

crnk-project / crnk-framework