Update dependency url-loader to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
url-loader	devDependencies	major	1.1.2 -> 4.1.0

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Release Notes

webpack-contrib/url-loader

v4.1.0

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Features

• the mimetype option can be Boolean
• added the encoding option
• added the generator option

v4.0.0

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⚠ BREAKING CHANGES

• deps: migrate on mime-types package, some rare types may have other mimetype

Bug Fixes

• description on the esModule option (#​204) (a2f127d)

• deps: migrate on mime-types package (#​209) (fc8721f)

v3.0.0

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BREAKING CHANGES

• minimum required nodejs version is 10.13.0
• rename the esModules option to esModule
• switch to ES modules by default (the option esModule is true by default)

v2.3.0

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Features

• new esModules option to output ES modules (0ee2b99)

2.2.0 (2019-10-04)

Features

• limit allow using Infinity and Number (#​192) (2bffcfd)
• pnp support (#​195) (196110e)

v2.2.0

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v2.1.0

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Features

• improved validation error messages (#​187) (f3d4dd2)

2.0.1 (2019-06-25)

Bug Fixes

• allow using limit as string when you use loader with query string (#​185) (4842f93)

v2.0.1

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v2.0.0

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Bug Fixes

• rm unnecessary bin field (#​163) (b603665)
• limit should always be a number and 0 value handles as number (#​180) (d82e453)
• fallback loader will be used than limit is equal or greater (#​179) (3c24545)

Features

• limit option can be boolean (#​181) (60d2cb3)

BREAKING CHANGES

• minimum required nodejs version is 8.9.0
• limit should always be a number and 0 value handles as number
• fallback loader will be used than limit is equal or greater (before only when greater)

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Caution: This PR has changes that must be merged to WordPress.com
Hello renovate[bot]! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer and confirm D47841-code works as expected before merging this PR. Once this PR is merged, please commit the changes to WP.com. Thank you!
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