Back to pull request #1575

Bump @webref/css from 6.18.1 to 6.20.3 in the development-dependencies group across 1 directory #5313

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Job	Run time
test (ubuntu-latest, 18)	1m 23s
test (ubuntu-latest, 20)	1m 24s
test (ubuntu-latest, 22)	7m 41s
test (macos-latest, 22)	1m 32s
test (windows-latest, 22)	2m 29s
	14m 29s