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

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
bootstrap-loader	^3.0.2 -> ^4.0.0

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Release Notes

shakacode/bootstrap-loader (bootstrap-loader)

v4.0.4

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Fixed

• Remove type entry from package.json introduced in 4.0.3 PR419 by ahangarha.

v4.0.3

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Fixed

• Upgraded dependencies to fix vulnerabilities, included loader-utils PR418 by ahangarha.

v4.0.2

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Dependabot

• Bump is-my-json-valid from 2.15.0 to 2.20.6 (#​406).
• Bump ini from 1.3.4 to 1.3.8 (#​405).

v4.0.1

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Improved

• update loader-utils to v1.4.1 to fix GHSA-76p3-8jx3-jpfq with CVSS 9.8 / 10. PR 410 by dargmuesli.

v4.0.0

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Fixed

• Now compatible with Webpack 5. Removed relative bootstraprc paths & addition of sourceMap to sass-loader querystring PR 401 by judahmeek.

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