chore(deps): update dependency gulp-svgmin to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gulp-svgmin	^1.2.3 -> ^4.0.0

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Release Notes

ben-eb/gulp-svgmin (gulp-svgmin)

v4.1.0

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• Bump svgo to v2.7.0. (thanks to @​djphan)

v4.0.1

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

v4.0.0

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• 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.

v3.0.0

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• Bump svgo to v1.3.2.
• Drop node 8 support.
• Update dependencies.

v2.2.0

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• Bump svgo to v1.2.1. (thanks to @​ekfuhrmann)

v2.1.0

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• Bump svgo to v1.1.x.
• Update babel-dependencies (but not yet to v7).

v2.0.0

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• Bump svgo to v1.0.x. (thanks to @​theverything)
• Drop dependency on deprecated 'gulp-util'. (thanks to @​TheDancingCode)
• Drop support for old node version.

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