build(deps): bump gatsby-source-filesystem from 5.14.0 to 5.15.0

Bumps [gatsby-source-filesystem](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-source-filesystem) from 5.14.0 to 5.15.0.
- [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-version: 5.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "gatsby-plugin-manifest": "^5.14.0",
     "gatsby-plugin-sharp": "^5.15.0",
     "gatsby-plugin-theme-ui": "^0.17.2",
-    "gatsby-source-filesystem": "^5.14.0",
+    "gatsby-source-filesystem": "^5.15.0",
     "gatsby-transformer-sharp": "^5.15.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",