chore(deps-dev): bump gulp-postcss from 9.0.1 to 9.1.0

[dependabot[bot]]

Bumps gulp-postcss from 9.0.1 to 9.1.0.

Release notes

Sourced from gulp-postcss's releases.

9.1.0

• Bump postcss-load-config to ^5.0.0
• Ensure options are passed to plugins when using postcss.config.js #170
• Update deps
• Drop support for node <18
• Add flake.nix for local dev with nix develop

Commits

• 77ed79a Merge pull request #187 from postcss/update-deps
• 687f29f Bump to 9.1.0
• c21fca9 Merge pull request #170 from JohnAlbin/pass-options-to-plugins
• bd9d4c0 Merge pull request #186 from postcss/bump-postcss-load-config
• 0f15414 Bump postcss-load-config
• 83dcfcd Merge branch 'main' into pass-options-to-plugins
• 5b98eae Fix typo in tests.
• 1cd7e21 Make ctx backward compatible with 9.0.0
• 65cb119 Fix docs about using a function in postcss.config.js
• c1c8055 Add docs explaining how to pass options when using postcss.config.js.
• Additional commits viewable in compare view

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[phil-davis]

https://drone.owncloud.com/owncloud/docs-ui/1836/1/3

+ yarn install
yarn install v1.22.21
[1/4] Resolving packages...
[2/4] Fetching packages...
error gulp-postcss@9.1.0: The engine "node" is incompatible with this module. Expected version ">=18". Got "16.20.2"
error Found incompatible module.

We need to move up to nodejs 18.

[phil-davis]

https://drone.owncloud.com/owncloud/docs-ui/1837/1/3

error gulp-squoosh@0.11.0: The engine "node" is incompatible with this module. Expected version " ^12.5.0 || ^14.0.0 || ^16.0.0 ". Got "18.17.1"

I bumped nodejs to v18. And now another dependency complains that node is too new.

Someone needs to sort out a set of dependencies that will all work with some version of nodejs. I will leave it to @mmattel

[dependabot[bot]]

A newer version of gulp-postcss exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.

[phil-davis]

@dependabot recreate

[dependabot[bot]]

Superseded by #763.