yarn audit --json out of memory handling

[geoffreyp7]

Hi, first of all thanks for providing and maintaining this package.

I've noticed an interesting issue relating to yarnpkg/yarn#7404

When the yarn audit runs out of memory as described in the yarn issue this results in audit-ci generating an audit pass.

It's hard to say what the expected behaviour is here.. I know the root issue is not the fault of this package, but a pass in this case could mask this issue for some time in a CI environment, missing vulnerabilites.

I've verified this by profiling memory usage, the instant it hits the max heap size an audit pass is generated.

[quinnturner]

Thank you for the bug report! Having audit-ci swallow and pass an audit on an out of memory error is definitely not the right behaviour. Should probably just bubble up the error and let the process exit with a failure.