Update dependency postcss-load-config to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-load-config	^5.0.0 -> ^6.0.0

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Release Notes

postcss/postcss-load-config (postcss-load-config)

### [`v6.0.1`](https://togithub.com/postcss/postcss-load-config/blob/HEAD/CHANGELOG.md#601-2024-06-02) [Compare Source](https://togithub.com/postcss/postcss-load-config/compare/6.0.0...6.0.1) ##### Bug Fixes - Fixed bundlers support ([#​262](https://togithub.com/postcss/postcss-load-config/pull/262)) ### [`v6.0.0`](https://togithub.com/postcss/postcss-load-config/compare/5.1.0...4be6dcff44bb0269c96d5b947d4daae59a0cfbb5) [Compare Source](https://togithub.com/postcss/postcss-load-config/compare/5.1.0...6.0.0)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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