chore(deps-dev): bump postcss and @patternfly/documentation-framework #1407

Job	Run time
call-build-lint-test-workflow / build	3m 40s
call-build-lint-test-workflow / test_jest	4m 28s
call-build-lint-test-workflow / lint	3m 20s
call-build-lint-test-workflow / test_a11y	2m 46s
call-build-lint-test-workflow / test_cypress	3m 12s
	17m 26s

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