Bump vuex from 3.1.1 to 3.1.2 in /js

Bumps [vuex](https://github.com/vuejs/vuex) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/vuejs/vuex/releases)
- [Commits](https://github.com/vuejs/vuex/compare/v3.1.1...v3.1.2)

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

js/package.json

@@ -23,7 +23,7 @@
     "ng-sortable": "^1.3.8",
     "ui-select": "^0.19.8",
     "vue": "^2.6.10",
-    "vuex": "^3.1.1"
+    "vuex": "^3.1.2"
   },
   "devDependencies": {
     "@babel/core": "^7.6.4",