refactor: upgrade rubyzip to 1.2.0
refactor: upgrade rubyzip to 1.2.0

The fix for JRuby's ObjectSpace is the motivation for this PR.

There doesn't appear to be any breaking changes, mostly bugfixes:
https://github.com/rubyzip/rubyzip/blob/master/Changelog.md#120

All tests pass with MRI/JRuby

randym/axlsx