Update rubyzip to fix security issue
Update rubyzip to fix security issue

Github reported us about CVE-2017-5946 which is a high severity issue.

This gem is used by Roo which already supports the Rubyzip version that
contains the fix (version 1.2.1). Check
https://github.com/roo-rb/roo/commit/872bb3a0b67fbecf7dd4bc23ff03b7c2764462b0
for further details.

Rubyzip's changelog for the version 1.2.1 can be found in
https://github.com/rubyzip/rubyzip/blob/master/Changelog.md#121.

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