chore: update dependency commitizen to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
commitizen	devDependencies	major	3.1.2 -> 4.1.2

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Release Notes

commitizen/cz-cli

v4.1.2

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Bug Fixes

• make cwd argument optional again (#​735) (be08907)

v4.1.1

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Bug Fixes

• deps: update dependency cz-conventional-changelog to v3.2.0 (#​657) (a95fe72)
• restore commitizen.congifLoader.load to public API (#​733) (a6adb3b)

v4.1.0

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Features

• remove dependency on ShellJS (#​729) (0f8644d)

v4.0.5

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Bug Fixes

• deps: bump vulnerable packages (ce1042e)

v4.0.4

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Bug Fixes

• add babel spread plugin (7642f05)
• move to babel.config.js (9ae386c)
• update azure devops images (607d514)

v4.0.3

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Bug Fixes

• deps: update dependency cz-conventional-changelog to v3 (#​654) (2a1a111)
• bump tests to release (#​656) (270cb5c)

v4.0.2

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Bug Fixes

• deps: update dependency lodash to v4.17.15 (#​652) (129a779)

v4.0.1

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Bug Fixes

• dep updates (#​650) (c48bfb4)

v4.0.0

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Bug Fixes

• node: remove node 6 and 8 support (#​649) (8931c6b)

BREAKING CHANGES

• node: Removal of two major node versions, 6 and 8 from testing scheme

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