Upgrade Vue + eslint to the latest version

frontend/package.json

@@ -26,7 +26,7 @@
     "sass-loader": "^8.0.2",
     "textversionjs": "^1.1.3",
     "turndown": "^7.0.0",
-    "vue": "^2.6.11",
+    "vue": "^2.6.12",
     "vue-c3": "^1.2.11",
     "vue-i18n": "^8.22.2",
     "vue-quill-editor": "^3.0.6",
@@ -34,18 +34,18 @@
     "vuex": "^3.4.0"
   },
   "devDependencies": {
-    "@vue/cli-plugin-babel": "~4.4.0",
-    "@vue/cli-plugin-eslint": "~4.4.0",
-    "@vue/cli-plugin-router": "~4.4.0",
-    "@vue/cli-plugin-vuex": "~4.4.0",
-    "@vue/cli-service": "~4.4.0",
-    "@vue/eslint-config-airbnb": "^5.0.2",
+    "@vue/cli-plugin-babel": "~4.5.13",
+    "@vue/cli-plugin-eslint": "~4.5.13",
+    "@vue/cli-plugin-router": "~4.5.13",
+    "@vue/cli-plugin-vuex": "~4.5.13",
+    "@vue/cli-service": "~4.5.13",
+    "@vue/eslint-config-airbnb": "^5.3.0",
     "babel-eslint": "^10.1.0",
     "cypress": "^6.4.0",
     "cypress-file-upload": "^5.0.2",
-    "eslint": "^6.7.2",
-    "eslint-plugin-import": "^2.20.2",
-    "eslint-plugin-vue": "^6.2.2",
-    "vue-template-compiler": "^2.6.11"
+    "eslint": "^7.27.0",
+    "eslint-plugin-import": "^2.23.3",
+    "eslint-plugin-vue": "^7.9.0",
+    "vue-template-compiler": "^2.6.12"
   }
 }