Bump gatsby from 3.12.1 to 3.13.0 (#634)

Bumps [gatsby](https://github.com/gatsbyjs/gatsby) from 3.12.1 to 3.13.0.
- [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@3.13.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -23,7 +23,7 @@
     "@giphy/js-fetch-api": "^4.1.1",
     "axios": "^0.21.3",
     "file-saver": "^2.0.5",
-    "gatsby": "^3.12.1",
+    "gatsby": "^3.13.0",
     "gatsby-plugin-image": "^1.13.0",
     "gatsby-plugin-manifest": "^3.12.0",
     "gatsby-plugin-matomo": "^0.10.0",