chore(examples/esbuild): update esbuild for vuln (#4480)

Refs: https://github.com/elastic/apm-agent-nodejs/security/dependabot/116

Author: trentm

examples/esbuild/package.json

@@ -12,6 +12,6 @@
     "pug": "^3.0.2"
   },
   "devDependencies": {
-    "esbuild": "^0.14.49"
+    "esbuild": ">=0.25.0"
   }
 }