fix: templates/experimental/worker-cobol/package.json to reduce vulne…

…rabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-GLOBPARENT-1016905
- https://snyk.io/vuln/SNYK-JS-WRANGLER-5819554

templates/experimental/worker-cobol/package.json

@@ -9,10 +9,10 @@
 		"dev": "wrangler dev src/index.js --local"
 	},
 	"devDependencies": {
-		"copy-webpack-plugin": "^5.1.1",
+		"copy-webpack-plugin": "^6.0.0",
 		"text-encoding": "^0.7.0",
 		"webpack": "^4.42.1",
 		"webpack-cli": "^4.9.0",
-		"wrangler": "^2.0.0"
+		"wrangler": "^3.1.1"
 	}
 }