chore(deps): update pnpm to v9.15.3 #3506

Job	Run time
Lint Test App	21s
embroider-optimized - Allowed to fail	1m 0s
Tests (Floating Dependencies)	55s
Lint Addon	21s
ember-beta - Allowed to fail	55s
ember-canary - Allowed to fail	46s
Tests (ember-4.0, false)	1m 10s
Tests (ember-lts-4.4, false)	1m 25s
Tests (ember-lts-4.8, false)	1m 0s
Tests (ember-4.12, false)	51s
Tests (ember-lts-5.8, false)	57s
Tests (ember-default, false)	51s
Tests (ember-release, false)	1m 31s
Tests (embroider-safe, false)	55s
	12m 58s

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