[Snyk] Security upgrade gatsby from 2.15.28 to 2.18.4

[bryanweast]

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:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	786/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 9.3	Incomplete List of Disallowed Inputs SNYK-JS-BABELTRAVERSE-5962462	No	Proof of Concept

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

Commit messages

Package name: gatsby

The new version differs by 250 commits.

• 168bb34 chore(release): Publish
• bda9f1f fix(gatsby): Remove relay compiler & use our own (#19665)
• 613304c swap broken link (#19747)
• a0094f4 chore(showcase): Add taroken.dev (#19788)
• 9fa44cd chore(showcase): Add owlypixel.com (#19773)
• 8c65d5f chore(starters): add gatsby-starter-amelie (#19760)
• f4cf70e chore(gatsby-theme-notes): Adjust directory-list margin (#19753)
• 9a458a3 chore(gatsby-theme-blog): Add missing css() invocations (#19673)
• d8a17a3 chore(starters): add gatsby-starter-hello-world-with-header-an… (#19647)
• 524862a fix(gatsby-plugin-google-analytics): Update typings (#19684)
• ca4a65c docs: guide for porting an html site to gatsby (#18609)
• 02207a8 Blogpost about .com/get-started (#19711)
• 559beb2 fix: update minor updates in packages (#19776)
• a9ed979 chore(starters): add gatsby-eth-dapp-starter (#19746)
• 3043786 fix(gatsby): memoize shadowCreatePagePath to fix performance r… (#19774)
• 5daf622 chore(showcase): Add lesleylai.info to sites.yml (#19749)
• 166bc14 chore(showcase) Add talkoverflow (#19754)
• 899a8ff chore: update minor updates in packages (#19772)
• 0f099f0 refactor(gatsby-source-wordpress): use includes (#19757)
• 4a0c103 chore(starters): add gatsby-minimalist-starter (#19724)
• 1b72cd9 chore(release): Publish
• e6ac315 Capatilise blog in theme README
• b81cbf8 chore(gatsby-plugin-offline): use Array.includes (#19740)
• 0e1d712 More noticable warning (#19719)

See the full diff

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