chore(packages): update gulp packages (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gulp-postcss	8.0.0 -> 9.0.1
gulp-sass	4.1.0 -> 5.1.0
gulp-sourcemaps	2.6.5 -> 3.0.0

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Release Notes

postcss/gulp-postcss

v9.0.1

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• Bump postcss-load-config to ^3.0.0

v9.0.0

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• Bump PostCSS to 8.0
• Drop Node 6 support
• PostCSS is now a peer dependency

dlmanning/gulp-sass

v5.1.0

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Huge shout out to @​XhmikosR for putting a ton of effort into this release 🎉

What's Changed

• Document usage in ESM modules by @​mxmason in https://github.com/dlmanning/gulp-sass/pull/805
• Typo @​ README.md by @​radimvaculik in https://github.com/dlmanning/gulp-sass/pull/807
• package.json: specify the files to include by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/817
• Enforce LF by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/814
• Update dependencies by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/816
• Switch to GitHub Actions CI by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/813
• Replace lodash with the lodash.clonedeep package by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/818
• Tweak README.md by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/821
• Move eslint to npm scripts by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/819
• Minor lint tweaks by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/820
• Fix fix script by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/823
• Minor tweaks and cleanup by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/822
• Update devDependencies and switch to Node.js 16/npm 7+ by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/829
• Update devDependencies by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/835
• Update README.md by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/832
• Clean up return statements by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/836
• CI: use lts/* for the lint job by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/839
• Replace chalk with picocolors by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/833
• Reword missing compiler message by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/834
• Remove should by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/841
• Remove transfob package by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/840
• Update CHANGELOG.md by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/831
• Add sass tests too by @​XhmikosR in https://github.com/dlmanning/gulp-sass/pull/842

New Contributors

• @​radimvaculik made their first contribution in https://github.com/dlmanning/gulp-sass/pull/807
• @​XhmikosR made their first contribution in https://github.com/dlmanning/gulp-sass/pull/817

Full Changelog: dlmanning/gulp-sass@v5.0.0...v5.1.0

v5.0.0

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June 25, 2021

https://github.com/dlmanning/gulp-sass/releases/tag/v5.0.0

v4.1.1

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June 24, 2021

https://github.com/dlmanning/gulp-sass/releases/tag/v4.1.1

gulp-sourcemaps/gulp-sourcemaps

v3.0.0: Security Fixes

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Nothing changed to the overall API.

However the following security fixes lead to the following:

• acorn which caused us to drop support for Node < 6 https://github.com/gulp-sourcemaps/gulp-sourcemaps/pull/376/files
• css bump #​380

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