Bump js-yaml and gulp-svgmin

[dependabot[bot]]

Removes js-yaml. It's no longer used after updating ancestor dependency gulp-svgmin. These dependencies need to be updated together.

Removes js-yaml

Updates gulp-svgmin from 3.0.0 to 4.1.0

Changelog

Sourced from gulp-svgmin's changelog.

4.1.0

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

4.0.1

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

4.0.0

• 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.

Commits

• b20d422 4.1.0
• 6a3d762 Update dependencies
• 1707d4e Initial changes to accept new preset default object setting in svgo (#124)
• 99614f5 Replace travis with GitHub action (#123)
• 85afb4b 4.0.1
• 676a814 Move lodash-clonedeep into dependencies
• dd04067 4.0.0
• 36df738 Update dependencies
• d5fc982 Set babel target to node 12
• 265c7f2 Fix prettier config to match xo config. (#110)
• Additional commits viewable in compare view

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