[Snyk] Security upgrade gatsby from 2.18.10 to 2.19.25

[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	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	479/1000 Why? Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-JS-POSTCSS-1255640	No	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.

• effcf8b chore(release): Publish
• b6de2b9 fix: hot fix for `gatsby develop` when HOME is not set (#21914)
• 0039221 Update using-client-side-only-packages.md (#21912)
• aa527f8 chore(showcase): add Messi vs Ronaldo (#21883)
• 4520836 chore(www): adds a description to the overview of features (#21306)
• ae30ba8 docs(deploying-to-firebase.md): add firebase.json cache configuration (#21897)
• 1f4db4b fix(gatsby): Improve warning for built-in GraphQL type overrides (#21899)
• 097b235 docs(api-proxy): update code exmaple with explicit require (#21830)
• 3ba9f9c fix(gatsby-source-medium): fix data fecthing & add limitation to readme (#17547)
• 8f75304 Chore(creators) add usama liaquat (#21865)
• 4f3cba6 Add date to rss feed (#21903)
• 131f1e8 feat(gatsby-plugin-preload-fonts): Add option to run in CI (#21037)
• ce0efb4 Improve consistent usage of "CSS" (#21874)
• 9162a8e (blog) Bulding multilingual sites with Gatsby (#21517)
• b808143 fix(docs): add trainling slashes to doc-links.yaml (#21872)
• 1af1180 fix(www): fallback to github renamed owner (starters) (#21858)
• 5b523bd feat(gatsby-remark-prismjs): add show invisibles plugin (#21439)
• 47b05fc fix(gatsby): bump flex-bug postcss-plugin and postcss-loader (#21398)
• 195f4da FIx (www): fixed rendering errors in showcase and starter pag… (#21876)
• a8b6f48 fix:(gatsby-plugin-mdx) Require a default export when needed (#21861)
• a87f1bd fix(gatsby): fix codepaths that result in js errors (#21829)
• dc484eb fix(gatsby): Check for nullable locations in query-runner (#21839)
• 6b7ed63 feat(gatsby): Allow silencing the warning for adding resolvers for missing types (#21769)
• b577e51 Fix broken starter url

See the full diff

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