Bump rubyzip from 1.2.3 to 1.2.4

Bumps rubyzip from 1.2.3 to 1.2.4.

Release notes

Sourced from rubyzip's releases.

v1.2.4

• Do not rewrite zip files opened with open_buffer that have not changed #360

Tooling / Documentation

• Update example_recursive.rb in README #397
• Hold CI at trusty for now, automatically pick the latest ruby patch version, use rbx-4 and hold jruby at 9.1 #399

Changelog

Sourced from rubyzip's changelog.

1.2.4 (2019-09-06)

• Do not rewrite zip files opened with open_buffer that have not changed #360

Tooling / Documentation

• Update example_recursive.rb in README #397
• Hold CI at trusty for now, automatically pick the latest ruby patch version, use rbx-4 and hold jruby at 9.1 #399

Commits

• 0d85cb6 Bump to 1.2.4
• 9a41ce6 Add more explicit test for #280
• eeef507 Add test case based on #146
• 7fbaf1e Merge pull request #360 from hainesr/fix-open-buffer
• ee6fb82 Merge pull request #399 from rubyzip/rbx-4
• 8dfc95d Hold jruby at 9.1 on JDK 7
• fc23db2 Update changelog for #399
• b2573f6 Use rbx-4 in CI
• 5152f6f Put CI back to trusty
• 2ffbc3b Merge pull request #397 from rubyzip/tidy-examples
• Additional commits viewable in compare view