Bump gulp-clean-css from 3.10.0 to 4.3.0

[dependabot-preview[bot]]

Bumps gulp-clean-css from 3.10.0 to 4.3.0.

Release notes

Sourced from gulp-clean-css's releases.

4.3.0

• clean-css @ v4.2.3 release

4.2.0

#69

4.1.1

#52

4.1.0

#71

4.0.1

#67

4.0.0

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

Commits

• 7eddd7d 4.3.0
• ecef686 remove EOL node versions from cicd
• f496e75 readme
• f3b28dd devdep update
• 6890286 Bump handlebars from 4.1.2 to 4.7.2 (#79)
• bd7ebcc Bump fstream from 1.0.11 to 1.0.12 (#80)
• 277971d Bump lodash from 4.17.11 to 4.17.15 (#81)
• 464070f Update node-sass so tests pass on Node 12 (#76)
• ddca050 4.2.0
• 7296d35 Avoid sharing _options across multiple streams (#69)
• Additional commits viewable in compare view

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