Bump vuex from 3.1.2 to 3.1.3

Bumps [vuex](https://github.com/vuejs/vuex) from 3.1.2 to 3.1.3.
- [Release notes](https://github.com/vuejs/vuex/releases)
- [Commits](https://github.com/vuejs/vuex/compare/v3.1.2...v3.1.3)

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

package.json

@@ -61,7 +61,7 @@
     "vue-router": "^3.1.6",
     "vue-server-renderer": "^2.6.11",
     "vue-template-compiler": "^2.6.11",
-    "vuex": "^3.1.2",
+    "vuex": "^3.1.3",
     "vuex-router-sync": "^5.0.0",
     "webpack": "^4.41.6",
     "webpack-cli": "^3.3.11",