Update dependency ts-loader to v8

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
ts-loader	dependencies	major	^8.0.2	source

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Release Notes

TypeStrong/ts-loader

v8.0.2

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• Fix 2 issues with experimentalWatchApi - thanks @​appzuka

v8.0.1

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• Fix webpack deprecations - thanks @​g-plane

v8.0.0

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• Support for symlinks in project references - thanks @​sheetalkamat!
• ts-loader now supports TypeScript 3.6 and greater BREAKING CHANGE

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