chore(deps): pin dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@fullhuman/postcss-purgecss	devDependencies	pin	^1.2.0 -> 1.2.0
@types/jest	devDependencies	pin	^24.0.18 -> 24.0.18
@types/node	devDependencies	pin	^12.7.2 -> 12.7.2
jest (source)	devDependencies	pin	^24.9.0 -> 24.9.0
ts-jest (source)	devDependencies	pin	^24.0.2 -> 24.0.2

:pushpin: Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges your config if you instead don't wish to pin dependencies.

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