Declare PHP version requirement in all Composer packages #66804

Job	Run time
Determine tests matrix	1m 6s
E2E: Build jetpack-boost	3m 50s
E2E: Build jetpack-core	4m 9s
E2E: Build jetpack-search	3m 59s
E2E: Build jetpack-social	3m 33s
E2E: Build jetpack-sync	3m 49s
E2E: Build jetpack-videopress	3m 4s
Jetpack connection e2e tests	6m 13s
Jetpack pre-connection e2e tests	3m 22s
Jetpack post-connection e2e tests	5m 51s
Jetpack sync e2e tests	4m 14s
Jetpack Boost - Base e2e tests	5m 25s
Jetpack Boost - Modules e2e tests	4m 44s
Jetpack Boost - Critical CSS e2e tests	4m 16s
Search e2e tests	5m 49s
VideoPress e2e tests	3m 0s
Social e2e tests	3m 39s
Slack notification	1m 26s
Test report	3s
	1h 11m 32s

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