Bump postcss from 8.4.28 to 8.4.31 in /test/frameworks/remix-indie #386

Job	Run time
test	19s
test-frameworks (express)	40s
test-frameworks (fastify)	32s
test-frameworks (gatsby)	1m 34s
test-frameworks (nest)	51s
test-frameworks (next-yarn)	1m 13s
test-frameworks (nuxt)	1m 31s
test-frameworks (remix-indie)	1m 51s
test-frameworks (adonisjs)	1m 44s
test-frameworks-yarn3 (next-yarn3)	1m 21s
test-alpine (alpine)	21s
	11m 57s

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