[Snyk] Security upgrade gatsby from 2.1.18 to 3.0.0

[mattpaulwilliamson]

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	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	566/1000 Why? Recently disclosed, Has a fix available, CVSS 5.6	Command Injection SNYK-JS-REACTDEVUTILS-1083268	Yes	No Known Exploit

(*) 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.

• f1d3f7b chore(release): Publish
• 6e6ea56 chore(release): Publish rc
• df50ce7 fix(gatsby): Add dir=ltr to Fast Refresh overlay (#29900) (#29908)
• 83adec5 chore(docs): update readme (#29837) (#29909)
• b2628da will git stop being weird (#29897) (#29907)
• c98c87f chore(release): Publish rc
• c8bf571 fix(gatsby-source-wordpress): image fixes (#29813) (#29886)
• 85bb8ea fix(gatsby-plugin-image): Update peerdeps (#29880) (#29888)
• c266b83 fix(gatsby): Remove `react-hot-loader` deps & other unused deps (#29864) (#29876)
• 222ca3f fix(gatsby): with some custom babel configs array spreading with Set is not safe (#29885) (#29889)
• ea31900 chore(release): Publish rc
• f070422 fix(gatsby): Fix various small DEV_SSR bugs exposed in development_runtime tests (#29720) (#29866)
• cb3b1ca chore: update peerdeps to latest major versions (#29857) (#29867)
• 8639f7b fix(create-gatsby): Use legacy peer deps (#29856) (#29862)
• fdc1fe2 fix(gatsby): fix some css HMR edge cases (#29839) (#29865)
• e8a7e3b fix(gatsby-plugin-preact): fix fast-refresh (#29831) (#29860)
• e7453c3 fix(gatsby): Improve Fast Refresh overlay styles (#29855) (#29861)
• 76f4f96 chore: upgrade postcss & plugins (#29793)
• de6cba6 chore(release): Publish rc
• aafe584 fix: query on demand loading indicator always active on preact. (#29829) (#29836)
• 34f5b8c fix(hmr): accept hot updates for modules above page templates (#29752) (#29835)
• b8d21f8 fix(gatsby): workaround graphql-compose issue (#29822) (#29834)
• 32fee71 fix(gatsby): eslint linting (#29796) (#29814)
• bca7951 fix(gatsby-source-wordpress): HTML image regex's (#29778) (#29816)

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