Bump postcss from 8.4.28 to 8.4.31 in /test/frameworks/remix-blues #383

Job	Run time
test-frameworks (express)	29s
test	26s
test-frameworks (fastify)	32s
test-frameworks (gatsby)	1m 32s
test-alpine (alpine)	15s
test-frameworks (nest)	44s
test-frameworks (next-yarn)	1m 14s
test-frameworks (nuxt)	1m 27s
test-frameworks-yarn3 (next-yarn3)	1m 16s
test-frameworks (remix-indie)	1m 52s
test-frameworks (adonisjs)	1m 54s
	11m 41s

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