[Snyk] Security upgrade gatsby from 2.1.18 to 2.16.2

[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

⚠️ Warning

``` Failed to update the package-lock.json, please update manually before merging. ```

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ACORN-559469	No	No Known Exploit

Commit messages

Package name: gatsby

The new version differs by 250 commits.

• f859947 chore(release): Publish
• 6de032d chore(docs): Update useStaticQuery example code (#18681)
• a5ec39f chore(docs): Updated pronouns as per style guide (#18680)
• 16e7802 chore(docs): Fix tutorial part 8 react helmet step 4 (#18687)
• a775081 Add link to Minimal Reproduction docs (#18653)
• aedd569 fix(gatsby-theme-blog-core): Normalize trailing slashes (#17871)
• 3d38af2 fix(gatsby): create page dependencies from contextual node model methods even if no path is passed (#18650)
• 6841250 chore(starters): add gatsby-contentful-starter (#18658)
• ccdc128 chore(docs): clarify local setup instructions (#18406)
• 17f0cdd Update @typescript-eslint packages (#18573)
• 66a7be7 chore(docs): Update tutorial part 8 (#18512)
• f45dec6 chore(docs): check titles, headlines & text (#18668)
• f641b55 chore(docs): Changed few "we" to "you" in gatsby-link.md (#18660)
• 8da19c4 chore(issue-templates): add comma after otherwise (#18666)
• 2b193aa chore(docs): Updated environment-variables to adhere to Gatsby… (#18670)
• d76a62a chore(docs): Update eslint to adhere to Gatsby style guide (#18671)
• 98350f3 chore(showcase): Add MarceloNM.com to showcase (#18673)
• 6e7b186 chore(docs): check titles, headlines & text + change some NOTE… (#18654)
• fef8e7e Add quotes to title (#18683)
• 29fdf39 chore(showcase): add opensourcegalaxy.com to showcases (#18662)
• 21e5274 Add enbonnet.me to showcase (#18646)
• 4fd307a chore(showcase): Add IBM Design, Edenspiekermann (#18637)
• 302aa26 fix(gatsby): Extend fields when merging types (#18500)
• ee70f9d [docs] improving Themes completeness (#18602)

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