[Snyk] Security upgrade sass-loader from 4.0.0 to 6.0.7

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	768/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.5	Prototype Pollution SNYK-JS-ASYNC-2441827	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: sass-loader

The new version differs by 144 commits.

• 44fe61c chore(release): 6.0.7
• fab89dc perf: use `neo-async` instead `async` (#538)
• 620bdd4 fix(package): add `webpack >= v4.0.0` (`peerDependencies`) (#541)
• a38344d docs(README): add example install instructions for dependencies (#517)
• db01033 docs(README): rephrase `resolve-url-loader` note (#516)
• 88b56d5 chore(package): update `clone-deep` v0.3.1...2.0.1 (#512)
• 9e40b78 ci(travis): Update Node v4 test target to 4.8
• a1ae204 chore: Update changelog for 6.0.6
• aed60eb chore(release): 6.0.6
• 85d7772 chore: Adds release script
• 43199f1 chore: Reformat changelog for standard-version
• 5daa32b chore(package): Adds contrib standard release tooling
• 0511c25 chore: build and package updates to allow use of webpack 3 (#475)
• 0d6d66d refactor: remove `this.cacheable` (#473)
• 876876a docs(readme): Fixes typo in loader description (#472)
• c27063c chore(package): update dependencies (#470)
• c61eaee Merge pull request #453 from webpack-contrib/Release/6.0.5
• fe4af44 chore(release): 6.0.5
• cbc0794 chore: Update changelog
• 5d06e9d fix: importing file directly from scoped npm package (#450)
• f01ae22 Merge pull request #449 from webpack-contrib/Release/6.0.4
• d9d8982 chore(release): 6.0.4
• 9c77792 chore: Update changelog
• f93c73f docs(README): change bootstrap path in example (#438)

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