test: allow for slow hosts in spawnSync() test
test-child-process-spawnsync-timeout failed from time to time on Raspberry Pi devices. Use common.platformTimeout() to allow a little more time to run on resource-constrained hosts.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test child_process