Update Webpacker npm module to 5.4.3

package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "@babel/core": "^7.12.10",
     "@babel/preset-env": "^7.12.11",
-    "@rails/webpacker": "5.2.1",
+    "@rails/webpacker": "5.4.3",
     "@typescript-eslint/eslint-plugin": "^4.11.0",
     "@typescript-eslint/parser": "^4.11.0",
     "coffee-loader": "1.0.1",
@@ -38,6 +38,6 @@
     "eslint": "^7.16.0",
     "eslint-plugin-import": "^2.22.1",
     "webpack": "^4",
-    "webpack-dev-server": "^3.11.0"
+    "webpack-dev-server": "^4.7.3"
   }
 }