[Snyk] Security upgrade gatsby from 2.15.6 to 2.31.0

[qsays]

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:
  • examples/gatsby-hot-reload/package.json
  • examples/gatsby-hot-reload/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	718/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 6.5	Information Exposure SNYK-JS-FOLLOWREDIRECTS-6444610	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.

• fbc5893 chore(release): Publish
• e693b62 chore: update yarn.lock (#29078)
• e998870 fix(gatsby): Always render the body component to ensure needed head & pre/post body components are added (#29077)
• a1921b5 feat(gatsby): bump opt-in % to dev-ssr to 20% (#29075)
• 2439b44 feat(gatsby-codemods): Handle or warn on nested options changes (#29046)
• c0e6c92 fix(gatsby-plugin-typescript): add missing options validations (#29066)
• 3163ca6 fix(gatsby-plugin-mdx): Add `root` to plugin validation (#29010)
• 6233382 fix(gatsby-plugin-image): Fix onload race condition (#29064)
• c76c175 benchmark(gabe-fs-markdown-images): add img benchmark (#29009)
• bd5b5f7 feat(gatsby): allow to skip cache persistence (#29047)
• 48db6ac fix(gatsby): fix broken GraphQL resolver tracing (#29015)
• 90b6e3d fix(gatsby): Use fast-refresh for React 17 (#28930)
• 9a55d12 feat(gatsby): Add eslint rules to warn against bad patterns in pageTemplates (for Fast Refresh) (#28689)
• b9978e1 fix(gatsby-plugin-image): Handle imgStyle in SSR (#29043)
• f23ba4b fix(gatsby-source-contentful): Improve base64 placeholders (#29034)
• 18b5f30 fix(security): update vulnerable packages, include React 17 in peerDeps (#28545)
• f8bbc06 docs: edit search documentation (#28737)
• 004acf0 fix(sharp) wrap sharp calls in try/catch to avoid crashing on bad images (#28645)
• bf6f264 Hydrate when the page was server rendered (#29016)
• e72533d chore(gatsby-plugin-image): Unflag remote images (#29032)
• 332543c chore(docs): adjust Contentful Rich Text example codes (#29029)
• 9bcc12c feat(gatsby-plugin-image): Change fullWidth to use breakpoints (#29002)
• 168ff60 Fix/contentful add header (#29028)
• a3ad6d7 fix(gatsbu-source-contentful): apply useNameForId when creating the graphql schema (#28649)

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