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ARROW-4301: [Java][Gandiva] Update version manually

It's just a workaround. We should update this in release process
automatically.

Author: Kouhei Sutou <kou@clear-code.com>

Closes #4087 from kou/java-gandiva-version-workaround and squashes the following commits:

ebeb571e <Kouhei Sutou>  Update version manually