Bump gatsby from 3.15.0 to 4.25.7

Bumps [gatsby](https://github.com/gatsbyjs/gatsby) from 3.15.0 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@3.15.0...gatsby@4.25.7)

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

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

Author: dependabot[bot]

package.json

@@ -27,7 +27,7 @@
     "babel-plugin-styled-components": "^1.10.7",
     "babel-preset-gatsby": "0.4.12",
     "core-js": "2.6.5",
-    "gatsby": "^3.0.0",
+    "gatsby": "^4.25.7",
     "gatsby-image": "2.4.9",
     "gatsby-plugin-google-analytics": "^3.0.0",
     "gatsby-plugin-image": "^1.0.0",