Minify stylesheets for twentytwentyone theme. #1639

Job	Run time
Test twentytwenty build script	21s
Test twentytwentytwo build script	9s
Test twentynineteen build script	10s
Test twentytwentyfive build script	9s
Test twentytwentyone build script	9s
twentyseventeen empty file check	19s
twentytwenty empty file check	7s
twentytwentythree empty file check	8s
twentytwentyfour empty file check	8s
twentytwentytwo empty file check	8s
twentynineteen empty file check	7s
twentytwentyfive empty file check	7s
twentysixteen empty file check	6s
twentyfourteen empty file check	6s
twentytwentyone empty file check	8s
twentytwelve empty file check	9s
twentyfifteen empty file check	7s
twentythirteen empty file check	7s
twentyeleven empty file check	7s
twentyten empty file check	7s
Create ${{ matrix.theme }} ZIP file	1s
Slack Notifications	0s
Failed workflow tasks	1s
	3m 1s

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