Update dependency nyc to ^15.1.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
nyc (source)	devDependencies	minor	^15.1.0	homepage, source

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Release Notes

istanbuljs/nyc

v15.1.0

Compare Source

Features

• experimental: Support using --all with node.js ESM (#​1320) (992359a)

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