fix(deps): update dependency postcss-load-config to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss-load-config	^3.1.4 → ^6.0.0

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Release Notes

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

v6.0.1

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Bug Fixes

• Fixed bundlers support (#​262)

v6.0.0

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v5.1.0

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Features

• Allow to use tsx for TypeScript support (#​260)

v5.0.3

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Bug Fixes

• Fixed update of ESM configs (#​259)

v5.0.2

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Bug Fixes

• Fixed __require name conflict (#​257)

v5.0.1

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Bug Fixes

• Fixed Windows support (#​256)

v5.0.0

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v4.0.2

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Bug Fixes

• src/index: added support for .cts files (#​252)
• deps: updated lilconfig (#​253)

v4.0.1

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Bug Fixes

• src/index: Fixed Windows support (#​238)

v4.0.0

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Bug Fixes

• package: require-from-string memory leak, updates cosmiconfig v2.1.0...4.0.0 (dependencies) (17f9621)
• src/index.js: clone the config {Object} on assignment instead of mutating it (8669a90)

Features

• src: load plugins from the current working directory (9745bf0)
• src: show config file in err.message (4baff47)

BREAKING CHANGES

• package: requires node >= v4.0.0
• package: removes argv option (options.argv)
• package: removes --config parsing

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