[Snyk] Security upgrade gulp-imagemin from 0.1.4 to 0.5.1

[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	Issue	Breaking Change	Exploit Maturity
	Arbitrary File Write via Archive Extraction (Zip Slip) SNYK-JS-DECOMPRESS-557358	No	Proof of Concept

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

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