Dependency deprecation warning: gulp-minify-css (nvm)

On registry `https://registry.npmjs.org/`, the "latest" version (v1.2.4) of dependency `gulp-minify-css` has the following deprecation notice:

`Please use gulp-clean-css`

Marking the latest version of an npm package as deprecated results in the entire package being considered deprecated, so contact the package author you think this is a mistake.

Please take the actions necessary to rename or substitute this deprecated package and commit to your base branch. If you wish to ignore this deprecation warning and continue using `gulp-minify-css` as-is, please add it to your [ignoreDeps](https://renovatebot.com/docs/configuration-options/#ignoredeps) array in Renovate config before closing this issue, otherwise another issue will be recreated the next time Renovate runs.

Affected package file(s): `package.json`