Bump pngquant from 4.0.0 to 4.1.0

[dependabot[bot]]

Bumps pngquant from 4.0.0 to 4.1.0.

Changelog

Sourced from pngquant's changelog.

v4.1.0 (2022-09-20)

Pull requests

• #98 esm (ubermanu)
• #94 Upgrade eslint-plugin-mocha to version 10.0.1 (depfu[bot])
• #91 Upgrade prettier to version 2.5.0 (depfu[bot])
• #86 Upgrade sinon to version 12.0.1 (depfu[bot])
• #81 Upgrade prettier to version 2.4.1 (depfu[bot])
• #84 Upgrade eslint-plugin-promise to version 5.1.1 (depfu[bot])
• #73 Upgrade sinon to version 11.1.1 (depfu[bot])
• #74 Upgrade eslint-plugin-mocha to version 9.0.0 (depfu[bot])
• #72 Upgrade prettier to version 2.3.0 (depfu[bot])
• #67 Upgrade sinon to version 10.0.0 (depfu[bot])

Commits to master

• Fix CHANGELOG generation in preversion script now that an npm env var changed (Andreas Lind)
• npm i --save-dev eslint-config-standard@latest eslint-plugin-n eslint-plugin-import@latest (Andreas Lind)
• Update eslint-plugin-promise to version 6.0.0 (depfu[bot])
• Replace Travis with Github Actions (Andreas Lind)
• Fix eslint-plugin-prettier usage (Andreas Lind)
• +2 more

Commits

• 89028fc 4.1.0
• b5b8756 Merge pull request #98 from ubermanu/master
• af54da8 add ts types
• 2bd66da update readme
• 57c5574 fix tests
• 3f36226 add support for es modules
• 69182b2 Fix CHANGELOG generation in preversion script now that an npm env var changed
• 1ef4314 npm i --save-dev eslint-config-standard@latest eslint-plugin-n eslint-plugin-...
• b95cb3d Merge remote-tracking branch 'origin/depfu/update/npm/eslint-8.6.0'
• adefdc4 Update eslint to version 8.6.0
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like pngquant is no longer a dependency, so this is no longer needed.