chore(deps): update dependency commitizen to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
commitizen	devDependencies	major	3.1.2 -> 4.0.0

---

Release Notes

commitizen/cz-cli

### [`v4.0.0`](https://togithub.com/commitizen/cz-cli/releases/v4.0.0) [Compare Source](https://togithub.com/commitizen/cz-cli/compare/v3.1.2...v4.0.0) ##### Bug Fixes - **node:** remove node 6 and 8 support ([#​649](https://togithub.com/commitizen/cz-cli/issues/649)) ([8931c6b](https://togithub.com/commitizen/cz-cli/commit/8931c6b)) ##### BREAKING CHANGES - **node:** Removal of two major node versions, 6 and 8 from testing scheme

---

Renovate configuration

:date: Schedule: At any time (no schedule defined).

:vertical_traffic_light: Automerge: Enabled.

:recycle: Rebasing: Whenever PR is stale, or if you modify the PR title to begin with "rebase!".

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Renovate Bot. View repository job log here.