chore(deps): update dependency ts-loader to v6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
ts-loader	devDependencies	major	^5.4.5 -> ^6.0.0	source

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Release Notes

TypeStrong/ts-loader

### [`v6.0.0`](https://togithub.com/TypeStrong/ts-loader/blob/master/CHANGELOG.md#v600) [Compare Source](https://togithub.com/TypeStrong/ts-loader/compare/v5.4.5...v6.0.0) - [Drop support for node < 8.6 related to micromatch upgrade to 4](https://togithub.com/TypeStrong/ts-loader/pull/930); see: [#​929](https://togithub.com/TypeStrong/ts-loader/issues/929) - [Update dependencies](https://togithub.com/TypeStrong/ts-loader/pull/928) - thanks [@​johnnyreilly](https://togithub.com/johnnyreilly)!

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