Bump postcss from 8.4.28 to 8.4.31 in /test/frameworks/remix-blues #403

Job	Run time
test-alpine (alpine)	16s
test	21s
test-frameworks (express)	35s
test-frameworks (fastify)	41s
test-frameworks-yarn3 (next-yarn3)	1m 13s
test-frameworks (gatsby)	1m 42s
test-frameworks (nest)	45s
test-frameworks (next-yarn)	1m 15s
test-frameworks (nuxt)	1m 21s
test-frameworks (remix-indie)	1m 50s
test-frameworks (adonisjs)	1m 47s
	11m 46s

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