chore(deps): update pnpm to v9.15.3 #3616

Job	Run time
Lint Addon	24s
Tests (ember-4.0, false)	1m 1s
embroider-optimized - Allowed to fail	50s
Tests (ember-lts-4.4, false)	46s
Tests (ember-lts-4.8, false)	52s
Tests (Floating Dependencies)	56s
Tests (ember-4.12, false)	53s
ember-beta - Allowed to fail	1m 14s
Lint Test App	31s
Tests (ember-lts-5.8, false)	48s
ember-canary - Allowed to fail	1m 16s
Tests (ember-default, false)	45s
Tests (ember-release, false)	1m 15s
Tests (embroider-safe, false)	1m 27s
	12m 58s

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