Bump nuxt from 2.14.12 to 2.15.8

Bumps [nuxt](https://github.com/nuxt/nuxt.js) from 2.14.12 to 2.15.8.
- [Release notes](https://github.com/nuxt/nuxt.js/releases)
- [Changelog](https://github.com/nuxt/nuxt.js/blob/dev/RELEASE_PLAN.md)
- [Commits](nuxt/nuxt@v2.14.12...v2.15.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -69,7 +69,7 @@
     "menubar": "^9.0.5",
     "mixpanel": "^0.13.0",
     "normalizr": "^3.6.1",
-    "nuxt": "^2.14.12",
+    "nuxt": "^2.15.8",
     "nuxt-i18n": "^6.28.1",
     "ress": "^4.0.0",
     "universal-analytics": "^0.4.23",