chore(deps): update dependency file-loader to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
file-loader	devDependencies	major	^3.0.1 -> ^4.0.0

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Release Notes

webpack-contrib/file-loader

v4.0.0

Compare Source

chore

• deps: update (#​333) (0d2f9b8)

BREAKING CHANGES

• deps: minimum required nodejs version is 8.9.0

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[alexander-akait]

Require node@8, can be merged only for next major release

[codecov]

Codecov Report

Merging #1971 into next will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## next #1971 +/- ##
=======================================
Coverage 92.47% 92.47% =======================================
Files 28 28 Lines 1076 1076 Branches 322 322 =======================================
Hits 995 995 Misses 77 77 Partials 4 4

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