Bump gatsby-source-filesystem from 3.1.0 to 3.2.0

Bumps [gatsby-source-filesystem](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-source-filesystem) from 3.1.0 to 3.2.0.
- [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/gatsby-source-filesystem@3.2.0/packages/gatsby-source-filesystem)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -115,7 +115,7 @@
     "gatsby-plugin-algolia": "^0.17.0",
     "gatsby-plugin-nprogress": "^3.1.0",
     "gatsby-source-custom-api": "^2.1.4",
-    "gatsby-source-filesystem": "^3.1.0",
+    "gatsby-source-filesystem": "^3.2.0",
     "husky": "^6.0.0",
     "identity-obj-proxy": "^3.0.0",
     "jest": "^26.6.3",