Bump gatsby from 4.14.1 to 4.15.1

Bumps [gatsby](https://github.com/gatsbyjs/gatsby) from 4.14.1 to 4.15.1.
- [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@4.14.1...gatsby@4.15.1)

---
updated-dependencies:
- dependency-name: gatsby
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -7,7 +7,7 @@
     "@fontsource/noto-sans-display": "^4.5.9",
     "@icons-pack/react-simple-icons": "^4.7.0",
     "dotenv": "^16.0.1",
-    "gatsby": "^4.14.1",
+    "gatsby": "^4.15.1",
     "gatsby-plugin-image": "^2.14.1",
     "gatsby-plugin-manifest": "^4.14.0",
     "gatsby-plugin-react-helmet": "^5.14.0",