@oclif/core starting with 2.9.x does not work with node-14.

[shazron]

See #731 and #630

engines property in package.json says it supports node-14 or greater, it does not support it anymore:

core/package.json

Line 85 in 859370b

"node": ">=14.0.0"

Releases 2.9.x or greater should have been a major version bump because of this.