[v10.x] Backport N-API 6 to v10.x#32488

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gabrielschulhof wants to merge 2 commits intonodejs:v10.x-stagingfrom

gabrielschulhof:backport-n-api-6-to-v10.x

Commits on Mar 25, 2020

n-api: correct instance data tests
Gabriel Schulhof
committed
n-api: define release 6
Gabriel Schulhof
and
legendecas
committed