chore(deps): bump @redocly/cli to 2.30.4 and postcss to 8.5.14 (#268223)

## Summary

Bump `@redocly/cli` to `2.30.4` and `postcss` to `8.5.14`.

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Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
(cherry picked from commit 49bddd1)

# Conflicts:
#	oas_docs/package-lock.json
#	oas_docs/package.json
#	package.json
#	x-pack/platform/plugins/shared/cases/docs/openapi/bundled.yaml
#	yarn.lock

Author: azasypkin