Update dependency ts-loader to v7

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
ts-loader	dependencies	major	^7.0.2	source

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Release Notes

TypeStrong/ts-loader

v7.0.2

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• Make content hash consistent across machines - thanks @​elyalvarado

v7.0.1

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• fix: watch-run - thanks @​zn4rk

v7.0.0

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• Project reference support enhancements - thanks @​sheetalkamat!
• Following the end of life of Node 8, ts-loader no longer supports Node 8 BREAKING CHANGE

v6.2.2

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• Enable typescript 3.8.3 support when using webpack.config.ts files - thanks @​vladimiry!

v6.2.1

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• Output types alongside JS files, enable declaration maps - thanks @​meyer!

v6.2.0

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• Emitting .tsbuildinfo when using watch api - thanks @​sheetalkamat!

v6.1.2

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• don't emit declaration files for a declaration file (#​1014) - thanks @​gvinaccia!
• Consume typescript apis from typescript nightly - thanks @​sheetalkamat!

v6.1.1

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• Fix SolutionBuilder watches and related fixes (#​998) - thanks @​sheetalkamat!
• fix: no errors reported if flagged with @​ts-check (#​1004) - thanks @​reinholdk!

v6.1.0

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• Build upstream project references with SolutionBuilder (#​851, #​913) - thanks @​sheetalkamat!

v6.0.4

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• Fix issue when handling files not included in tsconfig.json (#​934) - thanks @​davazp!

v6.0.3

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• Upgrade typescript version to 3.5.2 (#​954) - thanks @​fa93hws

v6.0.2

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• Set configFilePath when reading config file (#​939) - thanks @​konpikwastaken!

v6.0.1

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• Fix issue with resolveTypeReferenceDirective causing errors like Cannot find name 'it' with Jest (#​934) (#​919) - thanks @​andrewbranch!
• Fix TypeScript diagnostics not being printed to console when using project references (#​932) - thanks @​andrewbranch!

v6.0.0

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

v5.4.5

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• use @​types/webpack for loader typings - thanks @​LukeSheard!

v5.4.4

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• refactor: add common appendTsTsxSuffixesIfRequired function to instance - thanks @​johnnyreilly!

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