Tests

Bump cssnano from 6.1.0 to 6.1.1 #158

Job	Run time
Build tests (ubuntu-latest)	3m 23s
Code Hygiene	2m 0s
Build tests (windows-latest)	4m 35s
Integration tests (ubuntu-latest)	4m 21s
Integration tests (windows-latest)	5m 53s
Render tests (ubuntu-latest, 0)	7m 45s
Render tests (ubuntu-latest, 1)	6m 29s
Unit tests and Coverage	2m 5s
Render tests (ubuntu-latest, 2)	5m 53s
Render tests (windows-latest, 0)	9m 47s
Render tests (windows-latest, 1)	7m 43s
Render tests (windows-latest, 2)	6m 50s
	1h 6m 44s

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