fix: don't collect coverage on older Node.js

[jonkoops]

Had a small mistake in my previous PR, so coverage was still being collected even when not needed.

[coveralls]

Pull Request Test Coverage Report for Build 11784214373

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 11778731003:	0.0%
Covered Lines:	93
Relevant Lines:	93

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💛 - Coveralls

[github-actions[bot]]

:tada: This PR is included in version 3.0.0-beta.2 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: