[Snyk] Security upgrade gatsby from 2.0.19 to 2.0.84

[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	Issue	Breaking Change	Exploit Maturity
	Prototype Pollution SNYK-JS-AJV-584908	No	No Known Exploit

Commit messages

Package name: gatsby

The new version differs by 250 commits.

• d345a83 chore(release): Publish
• c3c49de chore: format
• 159d008 fix(examples): GraphQL reference codesandbox issue (#10807)
• 292c128 Change number of plugins from 'dozens' to 'hundreds' (#10822)
• 9c42672 Added escaladesports.com to showcase (#10817)
• 7beed15 chore: format (#10820)
• 62db8e6 docs(www): better GATSBY_SCREENSHOT_PLACEHOLDER explanation (#10797)
• e2a6aa1 Indicate code sample is JS (#10819)
• 91c08a7 feat(docs): Update GraphQL reference (#10810)
• 58aa740 Add gatsby-tailwindcss-sass-starter (#10806)
• a25ccfd Add Gatsby Blog MDX Starter (#10809)
• da9a580 feat(examples): GraphQL reference (#10803)
• 2429459 feat: update builtin ESLint to v5 (#10220)
• 2b439de chore(release): Publish
• 3214f01 chore: updated yarn.lock
• 1e3f3f3 chore(docs): rename unstructured data to using gatsby without graphql (#10782)
• d9e404c fix(blog): Add missing key (#10798)
• 2f4ee94 docs: remove Promise clutter from createPages
• 5f16e65 docs(gatsby): Minor tweak to warning message (#10778)
• a037575 Add Luca Crea's portfolio to showcase (#10783)
• 70bb589 Improve createPages of blog starter (#10781)
• c02b1c4 feat(starters): make copyright year dynamic (#10759)
• 060661f docs(gatsby): improve createPages example (#10777)
• 49c9324 Add gatsby minimal porfolio website blog starter (#10776)

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