Update dependency gulp-clean-css to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gulp-clean-css	^2.3.2 -> ^4.0.0

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Release Notes

scniro/gulp-clean-css (gulp-clean-css)

v4.3.0

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• clean-css @​ v4.2.3 release

v4.2.0

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#​69

v4.1.1

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#​52

v4.1.0

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#​71

v4.0.0

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• Deprecate supported node versions 4 & 5 (end of life)
• Address security vulnerability issues

v3.10.0

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• https://github.com/scniro/gulp-clean-css/issues/63

v3.9.4

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• update deps (mitigate known vulnerabilities)

v3.9.3

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• #​57

v3.9.2

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• https://github.com/scniro/gulp-clean-css/pull/50 (see discussion)

v3.9.1

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• https://github.com/scniro/gulp-clean-css/pull/50

v3.9.0: update clean-css dep to 4.1.9

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https://github.com/jakubpawlowicz/clean-css/releases/tag/v4.1.9

v3.8.0: update clean-css dep to 4.1.8

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https://github.com/jakubpawlowicz/clean-css/releases/tag/v4.1.8

v3.7.0: update clean-css dep to 4.1.7

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https://github.com/jakubpawlowicz/clean-css/releases/tag/v4.1.7

v3.6.0: update clean-css dep to 4.1.6

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https://github.com/jakubpawlowicz/clean-css/releases/tag/v4.1.6

v3.5.0: update clean-css dep to 4.1.5

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https://github.com/jakubpawlowicz/clean-css/releases/tag/v4.1.5

v3.4.2

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v3.4.1: inlined imports should be rebased to current file

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#​44

v3.4.0: Fix #​43 - dep update

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clean-css => 4.1.3

v3.3.1: Fixes #​42

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rebase: false by default

https://github.com/scniro/gulp-clean-css/issues/42

v3.3.0

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Fixing rebasing as seen at jakubpawlowicz/clean-css#937. Update clean-css to 4.1.2

v3.2.0

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Update clean css dep (4.1.1)

v3.1.1

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use strict for let support

v3.1.0

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Revisit rebasing issues. Update deps (4.1.0)

v3.0.4

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v3.0.3: Update clean-css

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v3.0.2: fix broken build for node 4.x (object-assign import without module)

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v3.0.1: upgrade to clean-css 4.0.5

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v3.0.0: major clean-css release

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v2.4.0: upgrade to clean-css 4.x

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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

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