Bump postcss-nested from 6.2.0 to 7.0.2 #1989

Job	Run time
Lint files	23s
Test addon (locked dependencies) (ember)	44s
Test addon (floating dependencies) (ember)	50s
Test compatibility (ember-lts-4.4)	1m 8s
Test addon (locked dependencies) (node)	22s
Test compatibility (ember-lts-4.8)	1m 2s
Test addon (locked dependencies) (test-apps)	1m 1s
Test compatibility (ember-lts-4.12)	1m 9s
Test addon (floating dependencies) (node)	28s
Test compatibility (ember-lts-5.4)	1m 1s
Test addon (floating dependencies) (test-apps)	50s
Test compatibility (ember-release)	58s
Test compatibility (ember-beta)	1m 0s
Test compatibility (ember-canary)	1m 0s
Test compatibility (embroider-safe)	1m 5s
	13m 1s

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