Update babel, deps, ember, switch to pnpm #1884

Job	Run time
Test addon (locked dependencies) (ember)	7m 18s
Test addon (floating dependencies) (ember)	7m 14s
Test addon (locked dependencies) (node)	44s
Lint files	53s
Test addon (floating dependencies) (node)	1m 8s
Test compatibility (ember-lts-4.4)	3m 8s
Test addon (locked dependencies) (test-apps)	7m 13s
Test addon (floating dependencies) (test-apps)	7m 12s
Test compatibility (ember-lts-4.8)	3m 27s
Test compatibility (ember-lts-4.12)	3m 54s
Test compatibility (ember-lts-5.4)	7m 14s
Test compatibility (ember-release)	7m 13s
Test compatibility (ember-beta)	7m 13s
Test compatibility (ember-canary)	7m 14s
Test compatibility (embroider-safe)	2m 54s
Deploy app	0s
	1h 13m 59s

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