Bump gatsby from 3.12.1 to 3.14.6

Bumps [gatsby](https://github.com/gatsbyjs/gatsby) from 3.12.1 to 3.14.6.
- [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@3.12.1...gatsby@3.14.6)

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

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

Author: dependabot[bot]

package.json

@@ -37,7 +37,7 @@
     "date-fns": "^2.27.0",
     "date-fns-tz": "^1.2.2",
     "eslint-plugin-mdx": "^1.16.0",
-    "gatsby": "^3.12.1",
+    "gatsby": "^3.14.6",
     "gatsby-link": "^3.11.0",
     "gatsby-plugin-alias-imports": "^1.0.5",
     "gatsby-plugin-google-gtag": "^3.14.0",