Bump postcss from 8.4.28 to 8.4.38 in /test/frameworks/gatsby #382

Job	Run time
test-frameworks-yarn3 (next-yarn3)	1m 8s
test-alpine (alpine)	21s
test	20s
test-frameworks (express)	48s
test-frameworks (fastify)	33s
test-frameworks (gatsby)	1m 42s
test-frameworks (nest)	50s
test-frameworks (next-yarn)	1m 11s
test-frameworks (nuxt)	1m 30s
test-frameworks (remix-indie)	1m 50s
test-frameworks (adonisjs)	1m 54s
	12m 7s

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