chore(deps): update pnpm to v9.15.4 #2654

Job	Run time
lint:types	28s
lint:css	26s
lint:hbs	27s
lint:js	43s
test	32s
Ember Try (ember-3.28)	6h 0m 12s
Ember Try (ember-4.12)	40s
Ember Try (ember-5.4)	42s
Ember Try (ember-5.8)	41s
Ember Try (ember-5.12)	39s
Ember Try (ember-release)	39s
Ember Try (ember-beta)	55s
Ember Try (ember-canary)	43s
Ember Try (embroider-safe)	46s
Ember Try (embroider-optimized)	44s
	6h 9m 17s

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