[Snyk] Security upgrade gulp-sass from 3.2.1 to 5.0.0

[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
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	481/1000 Why? Recently disclosed, Has a fix available, CVSS 3.7	Regular Expression Denial of Service (ReDoS) SNYK-JS-TAR-1536758	Yes	No Known Exploit

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

Commit messages

Package name: gulp-sass

The new version differs by 28 commits.

• 5775044 Update CHANGELOG.md
• 978b8f6 Update to major version 5 (How to do that session expiring automatically? #802)
• 10eae93 Update changelog for 4.1.1
• 947b26c Upgrade lodash to fix a security issue (fixing typos across documentation in gh-pages #776)
• 8d6ac29 Update changelog
• 43c0547 4.1.0
• ebe3ec6 Set appropriate file stat times (Request for JSCS #763)
• 7ab018e Migrate to the lodash package
• fa670c6 4.0.2
• fefa00e Revert package.json version bump
• 98254d2 Fix README typos
• 8a14419 Continue loading Node Sass by default
• 938afbe Add a note about synchronous versus asynchronous speed
• 7cc2db1 Make this package implementation-agnostic
• 643f73b Add documentation for synchronous code options
• 0b3c7e7 4.0.1
• daca90d Merge pull request Support Deploying MEANJS To Cloud Foundry #681 from DKvistgaard/master
• 71471c2 Declaring logError as function instead of arrow function.
• 450a7b8 4.0.0
• e9b1fe8 Fix node versions in appveyor.yml
• 44be409 Merge pull request adding more client tests causes $location:nobase error #667 from dlmanning/next
• 7656eff Adopt airbnb eslint preset
• 1293169 Bump autoprefixer@^8.1.0, gulp-postcss@^7.0.1
• 9fa817b Bump gulp-sourcemaps@^2.6.4

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