Upgrade vuex

Author: aLLeXUs

frontend/package.json

@@ -20,7 +20,7 @@
     "vue": "^2.6.11",
     "vue-infinite-loading": "^2.4.5",
     "vue-router": "^3.1.6",
-    "vuex": "^3.0.1"
+    "vuex": "^3.4.0"
   },
   "devDependencies": {
     "@vue/cli-plugin-babel": "^3.5.0",

frontend/yarn.lock

@@ -8309,7 +8309,7 @@ vue@^2.6.11:
   resolved "https://registry.yarnpkg.com/vue/-/vue-2.6.11.tgz#76594d877d4b12234406e84e35275c6d514125c5"
   integrity sha512-VfPwgcGABbGAue9+sfrD4PuwFar7gPb1yl1UK1MwXoQPAw0BKSqWfoYCT/ThFrdEVWoI51dBuyCoiNU9bZDZxQ==
 
-vuex@^3.0.1:
+vuex@^3.4.0:
   version "3.4.0"
   resolved "https://registry.yarnpkg.com/vuex/-/vuex-3.4.0.tgz#20cc086062d750769fce1febb34e7fceeaebde45"
   integrity sha512-ajtqwEW/QhnrBZQsZxCLHThZZaa+Db45c92Asf46ZDXu6uHXgbfVuBaJ4gzD2r4UX0oMJHstFwd2r2HM4l8umg==