chore(deps): update pnpm to v9.15.0 #3469

Job	Run time
Lint Addon	31s
Lint Test App	25s
Tests (Floating Dependencies)	1m 1s
embroider-optimized - Allowed to fail	59s
ember-beta - Allowed to fail	59s
Tests (ember-4.0, false)	1m 13s
ember-canary - Allowed to fail	53s
Tests (ember-lts-4.4, false)	54s
Tests (ember-lts-4.8, false)	1m 22s
Tests (ember-4.12, false)	55s
Tests (ember-lts-5.8, false)	56s
Tests (ember-default, false)	1m 35s
Tests (ember-release, false)	48s
Tests (embroider-safe, false)	45s
	13m 16s

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