[Snyk] Security upgrade sharp from 0.17.3 to 0.18.3

[kriptontr]

This PR was automatically created by Snyk using the credentials of a real user.

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:
  • functions/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	556/1000 Why? Recently disclosed, Has a fix available, CVSS 5.4	Open Redirect SNYK-JS-GOT-2932019	No	No Known Exploit

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

Commit messages

Package name: sharp

The new version differs by 54 commits.

• 18fd6ef Release v0.18.3
• 0004f5d Migrate from got to simple-get (#945)
• 5f29d1b Clarifying cache documentation (#919)
• 791fd35 Update README.md (#913)
• e0d622d Skip shrink-on-load when trimming (#887) (#888)
• 6b34e8a Docs: FreeBSD gcc v4/v5 needs _GLIBCXX_USE_C99 for C++11 #873
• eb8773f Use detect-libc instead of ldd output parsing
• b40e3fa Docs: Alpine vips-dev package requires fftw-dev also
• d25d761 Update benchmark deps, allow node-images to fail
• d6051dd Release v0.18.2
• 53ff061 Document SHARP_DIST_BASE_URL #841
• 72b0efd Remove possible switch case fall through
• df97ef2 Document/changelog for Solus Linux support #857
• f637397 Add support for Solus OS (#857)
• ec617f2 Document minimum Node dependency of v4.5.0 #847
• 502ae78 Allow binary download URL override via SHARP_DIST_BASE_URL #841
• 49297d6 Ensure flip and flop operations work with auto-rotate #837
• 29354ba Docs: add Alpine Linux install details
• 3c4de79 Dependency bumps and next point release
• c7f4488 Docs and changelog entry for #828
• d8765f9 Allow xres and yres to be set for TIFF output (#828)
• 9f20037 Release v0.18.1
• 2ebb090 Update Travis CI to Ubuntu 16.04
• 110fff3 Replace Node 7 with Node 8 in CI environment

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