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

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
ts-loader	devDependencies	major	^7.0.0 -> ^8.0.0

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Release Notes

TypeStrong/ts-loader

### [`v8.0.0`](https://togithub.com/TypeStrong/ts-loader/blob/master/CHANGELOG.md#v800) [Compare Source](https://togithub.com/TypeStrong/ts-loader/compare/v7.0.5...v8.0.0) - [Support for symlinks in project references](https://togithub.com/TypeStrong/ts-loader/pull/1136) - thanks [@​sheetalkamat](https://togithub.com/sheetalkamat)! - `ts-loader` now supports TypeScript 3.6 and greater **BREAKING CHANGE**

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[codecov[bot]]

Codecov Report

Merging #480 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #480   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files           7        7           
  Lines        1721     1721           
  Branches       97       97           
=======================================
  Hits         1642     1642           
  Misses         77       77           
  Partials        2        2           

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