Update dependency ts-loader to ^7.0.4

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
ts-loader	dependencies	patch	^7.0.4	source

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Release Notes

TypeStrong/ts-loader

v7.0.4

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• Ensure a separate webpack instance is created for different loader options - thanks @​appzuka

v7.0.3

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• Ensure that JSON files are included in build module resolution - thanks @​berickson1

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