fix: package.json to reduce vulnerabilities (#32)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ASYNC-2441827

Author: snyk-bot

package.json

@@ -45,7 +45,7 @@
   },
   "dependencies": {
     "@hapi/hoek": "^9.0.4",
-    "async": "^2.6.3",
+    "async": "^3.2.2",
     "screwdriver-logger": "^1.0.0",
     "screwdriver-scm-base": "^7.1.3"
   },