chore(deps): update dependency ts-loader to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ts-loader	devDependencies	major	6.2.2 -> 8.0.2

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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

v7.0.5

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• Add a delay before starting the comparison tests to avoid failures under WSL - thanks @​appzuka
• Apply other loaders when updating files in watch mode - thanks @​iorate

v7.0.4

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• Ensure a separate webpack instance is created for different loader options - thanks @​appzuka

v7.0.3

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• Ensure that JSON files are included in build module resolution - thanks @​berickson1

v7.0.2

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• Make content hash consistent across machines - thanks @​elyalvarado

v7.0.1

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• fix: watch-run - thanks @​zn4rk

v7.0.0

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• Project reference support enhancements - thanks @​sheetalkamat!
• Following the end of life of Node 8, ts-loader no longer supports Node 8 BREAKING CHANGE

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