[Snyk] Security upgrade node-sass from 4.7.2 to 4.9.0

[Jankyboy]

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
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	654/1000 Why? Has a fix available, CVSS 8.8	NULL Pointer Dereference SNYK-JS-NODESASS-540974	No	No Known Exploit

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

Commit messages

Package name: node-sass

The new version differs by 43 commits.

• 9d6faf6 Bump LibSass@3.5.4
• 739d768 Bump gcc@4.9 for Node 10
• a124e9d Add Node 10 to CI
• cc7301e Re-implement raw CSS imports for the deprecation warning
• 7ec14df Bump LibSass@3.5.3
• eb5ad0a Revert "Bump LibSass@3.5.3 (#2342)"
• 5e10a9b 4.9.0
• 4a858f1 Respect quiet option in Node API
• 8004d10 Bump LibSass@3.5.3 (#2342)
• 3ab7a16 Fix Node 10 check
• 1676810 fix: propagate async context
• 909f694 Add command that configure China mirror (#2206)
• 8e69acf Add note about bumping Request (#2291)
• b2df434 4.8.3
• 2558763 Silence g++7 switch case fallthrough warnings
• 968020e Propagate async_context
• ad00d8b Synchronous call should be synchronous
• b5c73ac Update NAN
• 5a8ea51 Lock to nan@2.9.2
• 84754d5 Bump LibSass 3.5.2
• 7648fc4 4.8.2
• 3709357 Bump LibSass to 3.5.1
• 96d0d0b 4.8.1
• a4564cc Update CHANGELOG

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project.

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