Update dependency prop-types to v15.8.1 #96215

Job	Run time
Determine tests matrix	1m 19s
E2E: Build jetpack-boost	3m 40s
E2E: Build jetpack-core	4m 15s
E2E: Build jetpack-search	4m 17s
E2E: Build jetpack-social	3m 45s
E2E: Build jetpack-sync	4m 19s
E2E: Build jetpack-videopress	3m 4s
Jetpack connection e2e tests	4m 5s
Jetpack pre-connection e2e tests	2m 32s
Jetpack post-connection e2e tests	4m 40s
Jetpack post editor e2e tests	3m 23s
Jetpack sync e2e tests	4m 41s
Jetpack Boost - Base e2e tests	3m 51s
Jetpack Boost - Modules e2e tests	4m 6s
Jetpack Boost - Critical CSS e2e tests	3m 48s
Jetpack Boost - Page Cache e2e tests	3m 29s
Jetpack Boost - Concatenate JS and CSS e2e tests	3m 22s
Jetpack Boost - Image CDN e2e tests	2m 58s
Jetpack Boost - Image Guide e2e tests	2m 59s
Search e2e tests	4m 1s
VideoPress e2e tests	2m 32s
Social e2e tests	4m 40s
Test report	2s
Slack notification	54s
	1h 20m 42s

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