Update dependency file-loader to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
file-loader	5.0.2 -> 6.2.0

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Release Notes

webpack-contrib/file-loader

v6.2.0

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Features

• added the sourceFilename property to asset info with original filename (#​393) (654e0d6)

Bug Fixes

• immutable flag when the name option have hash in query string (#​392) (381d8bd)

6.1.1 (2020-10-09)

Chore

• update schema-utils

v6.1.1

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v6.1.0

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Features

• pass immutable flag to asset info (#​383) (40fcde8)

v6.0.0

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⚠ BREAKING CHANGES

• use md4 by default for hashing (#​369) (ad39022)

v5.1.0

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Features

• support the query template for the name option (#​366) (cd8698b)

5.0.2 (2019-11-25)

Chore

• add the funding field in package.json

5.0.1 (2019-11-25)

Bug Fixes

• name of esModule option in source code (#​346) (31d6589)

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