build: update dependency resolve-url-loader to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
resolve-url-loader	4.0.0 -> 5.0.0

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Release Notes

bholloway/resolve-url-loader

v5.0.0

Compare Source

Breaking changes

• Require node>=12.
• Support only webpack>=4.
• Update to postcss@^8.
• Remove rework engine (which was deprecated in V4).

Bugfixes

• Fix log messages not correctly normalising absolute paths to posix style on Windows platform
• Fixes to end-to-end tests and test framework.

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