Bump postcss from 8.4.28 to 8.4.31 in /test/frameworks/remix-indie #422

Job	Run time
test-frameworks-yarn3 (next-yarn3)	1m 10s
test	29s
test-alpine (alpine)	16s
test-frameworks (express)	30s
test-frameworks (fastify)	31s
test-frameworks (gatsby)	1m 33s
test-frameworks (nest)	44s
test-frameworks (next-yarn)	1m 9s
test-frameworks (nuxt)	1m 21s
test-frameworks (remix-indie)	1m 51s
test-frameworks (adonisjs)	1m 41s
	11m 15s

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