Update dependency ts-loader to v6

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
ts-loader	devDependencies	major	^6.0.0	source

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Release Notes

TypeStrong/ts-loader

v6.0.0

Compare Source

• Drop support for node < 8.6 related to micromatch upgrade to 4; see: #​929
• Update dependencies - thanks @​johnnyreilly!

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