chore(deps-dev): bump @patternfly/documentation-framework from 6.10.19 to 6.21.0 #1255

Job	Run time
call-build-lint-test-workflow / build	1m 33s
call-build-lint-test-workflow / lint	1m 23s
call-build-lint-test-workflow / test_jest	2m 7s
call-build-lint-test-workflow / test_cypress	2m 11s
call-build-lint-test-workflow / test_a11y	2m 21s
	9m 35s

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