chore(deps): pin dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@babel/core (source)	devDependencies	pin	^7.10.1 -> 7.10.1
@babel/preset-env (source)	devDependencies	pin	^7.10.1 -> 7.10.1
gulp (source)	devDependencies	pin	^4.0.2 -> 4.0.2
gulp-autoprefixer	devDependencies	pin	^7.0.1 -> 7.0.1
gulp-babel	devDependencies	pin	^8.0.0 -> 8.0.0
gulp-clean-css	devDependencies	pin	^4.3.0 -> 4.3.0
gulp-header	devDependencies	pin	^2.0.9 -> 2.0.9
gulp-uglify	devDependencies	pin	^3.0.2 -> 3.0.2

: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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