CI/CD

Revert "pnpm update" #2101

Job	Run time
Test addon (floating dependencies) (ember)	18s
Lint files	17s
Test addon (floating dependencies) (test-apps)	17s
Test addon (locked dependencies) (node)	19s
Test addon (locked dependencies) (test-apps)	28s
Test compatibility (embroider-safe)	17s
Test compatibility (ember-lts-4.4)	30s
Test compatibility (ember-release)	18s
Test addon (locked dependencies) (ember)	18s
Test compatibility (ember-beta)	30s
Test addon (floating dependencies) (node)	19s
Test compatibility (ember-canary)	19s
Test compatibility (ember-lts-4.8)	19s
Test compatibility (ember-lts-5.4)	17s
Test compatibility (ember-lts-4.12)	23s
	5m 9s

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