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

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
ts-loader	dependencies	major	^5.4.5 -> ^6.0.0	source
ts-loader	devDependencies	major	^5.4.5 -> ^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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[codecov-io]

Codecov Report

Merging #5667 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #5667   +/-   ##
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  Coverage   95.57%   95.57%           
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  Files          81       81           
  Lines        2645     2645           
  Branches      673      673           
=======================================
  Hits         2528     2528           
  Misses         98       98           
  Partials       19       19

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[clarkdo]

@pi0 ts-loader v6 dropped support for node < 8.6 which is inconsistent with our node >= 8

[pi0]

/cc @kevinmarrec

For upcoming nuxt-ts we can change this minimum to 8.6 (as it is new, it is not a real breaking change), or as another option don't upgrade until node8 is not LTS which does not seems a good idea.

[kevinmarrec]

@clarkdo @pi0
One of the 2 ts-loader dependencies is a devDependency, so we don't mind.
The other one is shipped with @nuxt/typescript, so wen can force TS users to use node >=8.6

i.e. put this in packages/typescript/package.json :

"engines": {
    "node": ">=8.6.0"
  }

And then, with upcoming nuxt-ts, move or copy this engines statement in nuxt-tsdistribution package.json.

In any cases we just need to tell users that if they want TypeScript with last Nuxt version, they need to run on Node >= 8.6

EDIT : Worth noticing this upgrade won't affect non-TS users, as the node version restriction would be only around @nuxt/typescript package through ts-loader.

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