Update dependency ts-loader to v6.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ts-loader	devDependencies	patch	6.2.0 -> 6.2.1

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Release Notes

TypeStrong/ts-loader

### [`v6.2.1`](https://togithub.com/TypeStrong/ts-loader/blob/master/CHANGELOG.md#v621) [Compare Source](https://togithub.com/TypeStrong/ts-loader/compare/v6.2.0...v6.2.1) - [Output types alongside JS files, enable declaration maps](https://togithub.com/TypeStrong/ts-loader/pull/1026) - thanks [@​meyer](https://togithub.com/meyer)!

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