Bump gatsby from 2.23.10 to 4.25.7

Bumps [gatsby](https://github.com/gatsbyjs/gatsby) from 2.23.10 to 4.25.7.
- [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@2.23.10...gatsby@4.25.7)

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

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

package.json

@@ -8,7 +8,7 @@
     "@emotion/core": "^10.0.28",
     "@emotion/styled": "^10.0.27",
     "autoprefixer": "^9.8.3",
-    "gatsby": "^2.23.10",
+    "gatsby": "^4.25.7",
     "gatsby-image": "^2.4.8",
     "gatsby-plugin-emotion": "^4.3.5",
     "gatsby-plugin-github-ribbon": "^1.1.0",