Bump vue-i18n from 8.26.5 to 8.26.7 in /frontend

Bumps [vue-i18n](https://github.com/kazupon/vue-i18n) from 8.26.5 to 8.26.7.
- [Release notes](https://github.com/kazupon/vue-i18n/releases)
- [Changelog](https://github.com/kazupon/vue-i18n/blob/v8.x/CHANGELOG.md)
- [Commits](https://github.com/kazupon/vue-i18n/compare/v8.26.5...v8.26.7)

---
updated-dependencies:
- dependency-name: vue-i18n
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

frontend/package.json

@@ -14,7 +14,7 @@
     "socket.io-client": "^4.2.0",
     "vue": "^2.6.14",
     "vue-clipboard2": "^0.3.3",
-    "vue-i18n": "^8.26.5",
+    "vue-i18n": "^8.26.7",
     "vue-router": "^3.5.3",
     "vue-socket.io": "^3.0.10"
   },

frontend/yarn.lock

@@ -8774,10 +8774,10 @@ vue-hot-reload-api@^2.3.0:
   resolved "https://registry.npm.taobao.org/vue-hot-reload-api/download/vue-hot-reload-api-2.3.4.tgz#532955cc1eb208a3d990b3a9f9a70574657e08f2"
   integrity sha1-UylVzB6yCKPZkLOp+acFdGV+CPI=
 
-vue-i18n@^8.26.5:
-  version "8.26.5"
-  resolved "https://registry.yarnpkg.com/vue-i18n/-/vue-i18n-8.26.5.tgz#b61e994e7ae83564c6aebd004543156bbdc7c7e9"
-  integrity sha512-qYqfsFd8v2QFSLDAabqXXXpwjGvkuqJtTWqRpZPXpAFO6PArGH4A9vSplnA0HLmnB8km7OB5ZSdP8lkkX0rLew==
+vue-i18n@^8.26.7:
+  version "8.26.7"
+  resolved "https://registry.yarnpkg.com/vue-i18n/-/vue-i18n-8.26.7.tgz#adfd48373449fe31438c48e3b3bd43044dc3a681"
+  integrity sha512-7apa5PvRg1YCLoraE3lOgpCG8hJGupLCtywQWedWsgBbvF0TOgFvhitqK9xRH0PBGG1G8aiJz9oklyNDFfDxLg==
 
 "vue-loader-v16@npm:vue-loader@^16.1.0":
   version "16.2.0"