Bump postcss from 8.4.28 to 8.4.31 in /test/frameworks/remix-blues #384

Job	Run time
test-frameworks (express)	31s
test	25s
test-frameworks (fastify)	38s
test-frameworks (gatsby)	1m 33s
test-frameworks (nest)	51s
test-alpine (alpine)	16s
test-frameworks (next-yarn)	1m 18s
test-frameworks-yarn3 (next-yarn3)	1m 13s
test-frameworks (nuxt)	1m 28s
test-frameworks (remix-indie)	1m 57s
test-frameworks (adonisjs)	1m 34s
	11m 44s

Provide feedback