Add missing @babel/plugin-proposal-class-properties dependency

Author: Kocal

package.json

@@ -30,6 +30,7 @@
     },
     "devDependencies": {
         "@babel/core": "^7.15.8",
+        "@babel/plugin-proposal-class-properties": "^7.15.8",
         "@babel/preset-env": "^7.15.8",
         "@babel/preset-typescript": "^7.15.0",
         "@hotwired/stimulus": "^3.0",
@@ -92,5 +93,6 @@
         "dist/",
         "controllers.json",
         "lazy-controller-loader.js"
-    ]
+    ],
+    "packageManager": "[email protected]+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
 }