chore(deps): update pnpm to v9.15.4 #3488

Job	Run time
Tests (Floating Dependencies)	1m 12s
Lint Addon	22s
Lint Test App	27s
embroider-optimized - Allowed to fail	57s
ember-beta - Allowed to fail	43s
Tests (ember-4.0, false)	1m 2s
ember-canary - Allowed to fail	59s
Tests (ember-lts-4.4, false)	1m 4s
Tests (ember-lts-4.8, false)	49s
Tests (ember-4.12, false)	43s
Tests (ember-lts-5.8, false)	1m 26s
Tests (ember-default, false)	1m 3s
Tests (ember-release, false)	1m 5s
Tests (embroider-safe, false)	5m 42s
	17m 34s

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