Bump gatsby-source-filesystem from 2.0.36 to 2.1.22

Bumps [gatsby-source-filesystem](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-source-filesystem) from 2.0.36 to 2.1.22.
- [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@2.1.22/packages/gatsby-source-filesystem)

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

Author: dependabot-preview[bot]

package.json

@@ -14,7 +14,7 @@
     "gatsby-plugin-postcss": "^2.0.7",
     "gatsby-plugin-react-helmet": "^3.0.12",
     "gatsby-plugin-sharp": "^2.0.37",
-    "gatsby-source-filesystem": "^2.0.36",
+    "gatsby-source-filesystem": "^2.1.22",
     "gatsby-transformer-sharp": "^2.1.19",
     "gatsby-transformer-yaml": "^2.1.12",
     "postcss-custom-media": "^7.0.8",