fix(deps): update dependency which to v2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
which	dependencies	major	^1.0.9 -> ^2.0.0

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Release Notes

isaacs/node-which

### [`v2.0.2`](https://togithub.com/isaacs/node-which/blob/master/CHANGELOG.md#​202) [Compare Source](https://togithub.com/isaacs/node-which/compare/v2.0.1...v2.0.2) - Rename bin to `node-which` ### [`v2.0.1`](https://togithub.com/isaacs/node-which/blob/master/CHANGELOG.md#​201) [Compare Source](https://togithub.com/isaacs/node-which/compare/v2.0.0...v2.0.1) - generate changelog and publish on version bump - enforce 100% test coverage - Promise interface ### [`v2.0.0`](https://togithub.com/isaacs/node-which/blob/master/CHANGELOG.md#​200) [Compare Source](https://togithub.com/isaacs/node-which/compare/v1.3.1...v2.0.0) - Parallel tests, modern JavaScript, and drop support for node < 8

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