chore(deps): update dependency spatie/phpunit-watcher to v1.21.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
spatie/phpunit-watcher (source)	require-dev	patch	1.21.3 -> 1.21.4

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Release Notes

spatie/phpunit-watcher

### [`v1.21.4`](https://togithub.com/spatie/phpunit-watcher/blob/master/CHANGELOG.md#​1214---2019-12-04) [Compare Source](https://togithub.com/spatie/phpunit-watcher/compare/1.21.3...1.21.4) - fix compatibility with yosymfony/resource-watcher ([#​101](https://togithub.com/spatie/phpunit-watcher/issues/101))

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