Update dependency ts-loader to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ts-loader	devDependencies	major	7.0.5 -> 8.0.7

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Release Notes

TypeStrong/ts-loader

v8.0.7

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• Speeds up project reference build and doesnt store the result in memory - thanks @​sheetalkamat

v8.0.6

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• Fixed further deprecation warning on webpack@5 - thanks @​appzuka

v8.0.5

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• Fixed deprecation warnings on webpack@5 - thanks @​sanex3339

v8.0.4

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• Uses existing instance if config file is same as already built solution - thanks @​sheetalkamat

v8.0.3

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• Fix the wrong instance caching when using appendTsSuffixTo and appendTsxSuffixTo together - thanks @​meowtec

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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