Update dependency ts-node to ^8.4.1

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
ts-node	devDependencies	minor	^8.4.1	source

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Release Notes

TypeStrong/ts-node

v8.4.1

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Fixed

• Revert "List all files in memory cache improves perf 1.4x" 87a6e2c

v8.4.0

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Added

• Introduce transformers program support (#​879) 12ff53d

Fixed

• Fix prefer TS exts via env variables (#​867) b01b629

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