build: Bump nuxt-i18n from 6.21.0 to 6.21.1 in /src/frontend (#246)

Bumps [nuxt-i18n](https://github.com/nuxt-community/i18n-module) from 6.21.0 to 6.21.1.
- [Release notes](https://github.com/nuxt-community/i18n-module/releases)
- [Changelog](https://github.com/nuxt-community/i18n-module/blob/master/CHANGELOG.md)
- [Commits](nuxt-modules/i18n@v6.21.0...v6.21.1)

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

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

src/frontend/package.json

@@ -33,7 +33,7 @@
     "imagemin-svgo": "^9.0.0",
     "nuxt": "^2.15.3",
     "nuxt-buefy": "^0.4.4",
-    "nuxt-i18n": "^6.21.0",
+    "nuxt-i18n": "^6.21.1",
     "particles-bg-vue": "^1.3.5",
     "prettier": "^2.2.1",
     "sass": "^1.32.8",