swap to pnpm #130

Job	Run time
Floating Dependencies	1m 18s
Tests and Linting	1m 9s
ember-try: ember-lts-3.16	36s
ember-canary - Allowed to fail	1m 16s
ember-try: ember-lts-3.20	39s
ember-beta - Allowed to fail	1m 26s
ember-try: ember-lts-3.24	38s
ember-release-no-deprecations - Allowed to fail	1m 15s
ember-try: ember-lts-3.28	1m 12s
ember-try: ember-release	40s
ember-try: ember-default-with-jquery	1m 20s
ember-try: ember-classic	1m 20s
ember-try: embroider-safe	44s
ember-try: embroider-optimized	43s
ember-try: no-deprecations	1m 13s
	15m 29s

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