Bump gatsby from 5.4.2 to 5.9.1

Bumps [gatsby](https://github.com/gatsbyjs/gatsby) from 5.4.2 to 5.9.1.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/compare/gatsby@5.4.2...gatsby@5.9.1)

---
updated-dependencies:
- dependency-name: gatsby
  dependency-type: direct:production
...

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

package.json

@@ -64,7 +64,7 @@
     "docsearch.js": "^2.6.3",
     "ease-component": "^1.0.0",
     "fs-extra": "^11.1.0",
-    "gatsby": "^5.4.2",
+    "gatsby": "^5.9.1",
     "gatsby-plugin-alias-imports": "^1.0.5",
     "gatsby-plugin-image": "^3.4.0",
     "gatsby-plugin-robots-txt": "^1.8.0",