Use pnpm@9 (#238) #1002

Job	Run time
Build (docs-app)	48s
Test compatibility (ember-lts-4.4)	1m 6s
Test (packages/ember-container-query)	24s
Test compatibility (ember-lts-4.8)	49s
Lint (docs-app)	33s
Test (test-app)	41s
Test compatibility (ember-lts-4.12)	55s
Lint (packages/ember-container-query)	26s
Test compatibility (ember-lts-5.4)	54s
Lint (test-app)	27s
Test compatibility (ember-lts-5.8)	48s
Test compatibility (ember-release)	57s
Test compatibility (ember-beta)	49s
Test compatibility (ember-canary)	50s
Test compatibility (embroider-safe)	1m 14s
Test compatibility (embroider-optimized)	57s
Test (docs-app) (w1-h1)	48s
Test (docs-app) (w2-h1)	52s
Test (docs-app) (w3-h1)	43s
Test (docs-app) (w1-h2)	44s
Test (docs-app) (w2-h2)	50s
Test (docs-app) (w3-h2)	46s
Test (docs-app) (w1-h3)	1m 3s
Test (docs-app) (w2-h3)	44s
Test (docs-app) (w3-h3)	44s
	19m 52s

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