fix(deps): update dependency postcss to v8.4.49 in package.json

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
postcss (source)	dependencies	patch	8.4.48 -> 8.4.49

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Release Notes

postcss/postcss (postcss)

### [`v8.4.49`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8449) [Compare Source](https://redirect.github.com/postcss/postcss/compare/8.4.48...8.4.49) - Fixed custom syntax without `source.offset` (by [@​romainmenke](https://redirect.github.com/romainmenke)).

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