Bump postcss from 8.4.28 to 8.4.31 in /test/base/windows (#89) #413

Job	Run time
test-alpine (alpine)	18s
test	20s
test-frameworks (express)	36s
test-frameworks-yarn3 (next-yarn3)	1m 12s
test-frameworks (fastify)	32s
test-frameworks (gatsby)	1m 33s
test-frameworks (nest)	46s
test-frameworks (next-yarn)	1m 13s
test-frameworks (nuxt)	1m 22s
test-frameworks (remix-indie)	1m 57s
test-frameworks (adonisjs)	1m 47s
	11m 36s

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