Bump adm-zip from 0.6.0 to 0.6.1 in /protoc_plugin

Bumps [adm-zip](https://github.com/cthackers/adm-zip) from 0.6.0 to 0.6.1.
- [Release notes](https://github.com/cthackers/adm-zip/releases)
- [Changelog](https://github.com/cthackers/adm-zip/blob/master/history.md)
- [Commits](cthackers/adm-zip@v0.6.0...v0.6.1)

---
updated-dependencies:
- dependency-name: adm-zip
  dependency-version: 0.6.1
  dependency-type: direct:production
...

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