fix: upgrade vue-property-decorator from 8.4.1 to 8.4.2

Snyk has created this PR to upgrade vue-property-decorator from 8.4.1 to 8.4.2.

See this package in NPM:
https://www.npmjs.com/package/vue-property-decorator

See this project in Snyk:
https://app.snyk.io/org/eidng8/project/13b4d2dd-140a-4eab-a90f-585d57258000?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -38,7 +38,7 @@
     "core-js": "^3.6.5",
     "vue": "^2.6.11",
     "vue-class-component": "^7.2.3",
-    "vue-property-decorator": "^8.4.1"
+    "vue-property-decorator": "^8.4.2"
   },
   "devDependencies": {
     "@types/jest": "^24.0.19",