Pin dependencies

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	Change
clean-css-cli	devDependencies	pin	^4.3.0 -> 4.3.0
uglify-js	devDependencies	pin	^3.9.4 -> 3.16.3

Add the preset :preserveSemverRanges to your config if you don't want to pin your dependencies.

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