Update pnpm to v9.15.0 [SECURITY] #95930

Job	Run time
Determine tests matrix	1m 22s
E2E: Build jetpack-boost	3m 22s
E2E: Build jetpack-core	4m 6s
E2E: Build jetpack-search	4m 20s
E2E: Build jetpack-social	4m 3s
E2E: Build jetpack-sync	4m 17s
E2E: Build jetpack-videopress	3m 0s
Jetpack connection e2e tests	5m 20s
Jetpack pre-connection e2e tests	2m 57s
Jetpack post-connection e2e tests	4m 36s
Jetpack post editor e2e tests	3m 10s
Jetpack sync e2e tests	3m 30s
Jetpack Boost - Base e2e tests	3m 47s
Jetpack Boost - Modules e2e tests	3m 48s
Jetpack Boost - Critical CSS e2e tests	3m 54s
Jetpack Boost - Page Cache e2e tests	3m 47s
Jetpack Boost - Concatenate JS and CSS e2e tests	3m 41s
Jetpack Boost - Image CDN e2e tests	3m 30s
Jetpack Boost - Image Guide e2e tests	3m 10s
Search e2e tests	4m 5s
VideoPress e2e tests	2m 50s
Social e2e tests	5m 13s
Slack notification	1m 4s
Test report	4s
	1h 22m 56s

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