actions: Use node20 runner #70990

Job	Run time
Determine tests matrix	1m 0s
E2E: Build jetpack-boost	3m 26s
E2E: Build jetpack-core	3m 55s
E2E: Build jetpack-search	3m 40s
E2E: Build jetpack-social	3m 32s
E2E: Build jetpack-sync	4m 0s
E2E: Build jetpack-videopress	3m 6s
Jetpack connection e2e tests	5m 27s
Jetpack pre-connection e2e tests	3m 11s
Jetpack post-connection e2e tests	5m 31s
Jetpack sync e2e tests	4m 57s
Jetpack Boost - Base e2e tests	4m 37s
Jetpack Boost - Modules e2e tests	4m 31s
Jetpack Boost - Critical CSS e2e tests	4m 11s
Search e2e tests	5m 0s
VideoPress e2e tests	3m 0s
Social e2e tests	3m 29s
Slack notification	1m 0s
Test report	7s
	1h 7m 40s

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