Update dependency @babel/plugin-proposal-decorators to v7.12.12

Author: renovate-bot

package.json

@@ -72,7 +72,7 @@
   "devDependencies": {
     "@babel/core": "7.12.10",
     "@babel/plugin-proposal-class-properties": "7.12.1",
-    "@babel/plugin-proposal-decorators": "7.12.1",
+    "@babel/plugin-proposal-decorators": "7.12.12",
     "@babel/plugin-proposal-export-namespace-from": "7.12.1",
     "@babel/plugin-proposal-function-sent": "7.12.1",
     "@babel/plugin-proposal-json-strings": "7.12.1",