Update pnpm to v9.15.1 #1204

Job	Run time
Lints	1m 14s
Test ember-scoped-css	55s
Test test-apps/classic-app	1m 48s
Test test-apps/embroider-app	1m 24s
Test test-apps/pods-embroider-app	1m 17s
Test test-apps/pods-classic-app	1m 11s
Floating ember-scoped-css	1m 0s
ember-lts-4.4	2m 7s
Floating test-apps/classic-app	1m 58s
ember-lts-4.12	2m 21s
Floating test-apps/embroider-app	1m 17s
ember-lts-5.4	2m 18s
Floating test-apps/pods-embroider-app	1m 16s
ember-lts-5.8	2m 3s
Floating test-apps/pods-classic-app	1m 15s
ember-release	2m 7s
ember-beta	2m 5s
	27m 36s

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