fix java version in contributing doc

eclipse / eclipse-collections

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.

http://www.eclipse.org/collections

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Closed yoa1226 closed 1 week ago

yoa1226 commented 3 weeks ago

Eclipse Collections 12.x will be compatible with Java 11+. The project build failed when I use java 1.8.