[Snyk] Security upgrade gatsby-source-filesystem from 2.4.2 to 4.21.0

[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:
  • docs/package.json
  • docs/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	484/1000 Why? Has a fix available, CVSS 5.4	Open Redirect SNYK-JS-GOT-2932019	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: gatsby-source-filesystem

The new version differs by 250 commits.

• b8eac2d chore(release): Publish
• 3253a38 fix(gatsby-plugin-mdx): Hashing and pluginOptions (#36387) (#36395)
• 1880491 fix(gatsby-script): Reach router import (#36385) (#36394)
• f664ad2 feat(gatsby): Telemetry tracking for Head API (#36352)
• ab55e4e chore: Update `got` (#36366)
• 2b4ff76 fix(gatsby): Make runtime error overlay work in non-v8 browsers (#36365)
• f990e08 fix(test): clear and close lmdb after each test suite (#36343)
• 7fcf580 fix(gatsby): e.remove() is not a function when using Gatsby Head API (#36338)
• 25fb9d1 chore: Fix pipeline tests (#36363)
• a9132a5 chore(deps): update sharp (#35539)
• bc80c23 chore: Add note about rehype-slug-custom-id
• 5b6f1f6 chore(gatsby): upgrade multer (#36359)
• f2f0acf chore(gatsby-telemetry): upgrade git-up (#36358)
• 86a8efc chore(release): Publish next
• 0705ac7 chore(gatsby-plugin-mdx): Update .gitignore
• c92db36 BREAKING CHANGE(gatsby-plugin-mdx): MDX v2 (#35650)
• 3c0dd6d chore(release): Publish next
• 86b6ee9 Revert "chore(gatsby): Make `plugins` in `PluginOptions` type optional (#36351)"
• a2fa5a2 chore(gatsby): Make `plugins` in `PluginOptions` type optional (#36351)
• 6ecfe4a fix(gatsby-source-contentful): Correctly overwrite field type on Assets (#36337)
• 0ed362c chore(docs): Pre-encoded unicode characters can't be used in paths (#36325)
• 2bbe96d fix(deps): update dependency file-type to ^16.5.4 for gatsby-source-filesystem (#36276)
• 2be3fa7 chore(docs): Add first batch of Cloud docs (#36218)
• 4238142 chore(docs): Remove outdated examples and recipes (#36335)

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