build(deps): bump gatsby-source-filesystem in /docs (#2800)

Bumps [gatsby-source-filesystem](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-source-filesystem) from 4.11.1 to 4.13.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-source-filesystem/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/[email protected]/packages/gatsby-source-filesystem)

---
updated-dependencies:
- dependency-name: gatsby-source-filesystem
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/package-lock.json

@@ -32,7 +32,7 @@
     "gatsby-remark-images": "^6.11.1",
     "gatsby-remark-mermaid": "^2.1.0",
     "gatsby-remark-responsive-iframe": "^5.11.0",
-    "gatsby-source-filesystem": "^4.11.1",
+    "gatsby-source-filesystem": "^4.13.0",
     "gatsby-transformer-remark": "^5.11.1",
     "gatsby-transformer-sharp": "^4.11.0",
     "gatsby-transformer-yaml": "^4.11.0",