Bump vuetify from 2.1.15 to 2.2.9 in /client

Bumps [vuetify](https://github.com/vuetifyjs/vuetify/tree/HEAD/packages/vuetify) from 2.1.15 to 2.2.9.
- [Release notes](https://github.com/vuetifyjs/vuetify/releases)
- [Commits](https://github.com/vuetifyjs/vuetify/commits/v2.2.9/packages/vuetify)

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

client/package.json

@@ -16,7 +16,7 @@
     "register-service-worker": "^1.6.2",
     "vue": "^2.6.11",
     "vue-router": "^3.1.5",
-    "vuetify": "^2.1.15",
+    "vuetify": "^2.2.9",
     "vuex": "^3.1.2"
   },
   "devDependencies": {