chore(deps): update dependency postcss-loader to v7.3.4 #1499

Job	Run time
Install	36s
Lint	53s
Build Tests	47s
Default Tests	1m 2s
[email protected]	58s
Typecheck Docs	1m 8s
[email protected]	1m 12s
Floating Deps Test	1m 28s
[email protected]	1m 18s
Publish Docs to Cloudflare Pages	2m 21s
ember-lts-3.28	1m 45s
ember-4.0	1m 25s
ember-lts-4.4	1m 23s
ember-lts-4.8	1m 23s
ember-lts-4.12	1m 14s
ember-release	1m 22s
ember-beta	1m 3s
ember-canary	1m 18s
'ember-release + embroider-safe'	1m 22s
'ember-release + embroider-optimized'	1m 32s
'ember-lts-3.28 + embroider-optimized'	1m 41s
'ember-lts-4.4 + embroider-optimized'	1m 45s
'ember-lts-4.8 + embroider-optimized'	1m 35s
Post Preview URL as comment to PR	46s
Release	0s
	31m 17s

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