Update dependency gulp-svgmin to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gulp-svgmin	3.0.0 -> 4.0.1

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Release Notes

ben-eb/gulp-svgmin

v4.0.1

Compare Source

• Move lodash.clonedeep into dependencies, fixes #​120 (thanks to @​donmahallem)

v4.0.0

Compare Source

• Bump svgo to v2.3.1. (thanks to @​JohnAlbin)
• Drop node 10 support.
• Replace eslint-config-cssnano with xo.
• Update babel to v7 and ava to v3 (thanks to @​JohnAlbin)
• Update dependencies.

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[calebeby]

@tylersticka Do you mind reviewing my changes? gulp-svgmin updates svgo to v2. The breaking change is the way plugins are specified. If you specify a plugins array, then svgo disables all the default plugins and only uses the ones you specify. You have to call the extendDefaultPlugins function to merge the plugin array with the default plugins. That's not possible in a yml file, so I moved the svgo config to the svg-to-twig gulp task. Can you confirm that I'm not breaking anything, and especially that the svgo config isn't used anywhere else?

[tylersticka]

The .svgo.yml file was primarily used by our Storybook icon listing. This change introduces regressions as the default SVGO settings are too aggressive.

[calebeby]

svgr only supports svgo 1: https://github.com/gregberge/svgr/blob/main/packages/plugin-svgo/package.json.

Closing this PR until svgr supports svgo 2 (I don't want to have multiple svgo versions and have to manage multiple svgo configs)

[renovate]

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