chore(deps): update pnpm to v9.15.5 #3677

Job	Run time
Lint Test App	25s
Tests (Floating Dependencies)	1m 2s
embroider-optimized - Allowed to fail	39s
Lint Addon	29s
Tests (ember-4.0, false)	46s
ember-beta - Allowed to fail	55s
Tests (ember-lts-4.4, false)	51s
ember-canary - Allowed to fail	1m 23s
Tests (ember-lts-4.8, false)	48s
Tests (ember-4.12, false)	1m 17s
Tests (ember-lts-5.8, false)	59s
Tests (ember-default, false)	1m 35s
Tests (ember-release, false)	1m 14s
Tests (embroider-safe, false)	1m 3s
	13m 26s

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