fix: upgrade async from 3.2.0 to 3.2.1

Snyk has created this PR to upgrade async from 3.2.0 to 3.2.1.

See this package in npm:
https://www.npmjs.com/package/async

See this project in Snyk:
https://app.snyk.io/org/johnmclear/project/d9a12bfb-7ccd-443f-9e22-f30d339cc8c5?utm_source=github&utm_medium=upgrade-pr

src/package-lock.json

@@ -904,9 +904,9 @@
       "dev": true
     },
     "async": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
-      "integrity": "sha512-TR2mEZFVOj2pLStYxLht7TyfuRzaydfpxr3k9RpHIzMgw7A64dzsdqCxH1WJyQdoe8T10nDXd9wnEigmiuHIZw=="
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.1.tgz",
+      "integrity": "sha512-XdD5lRO/87udXCMC9meWdYiR+Nq6ZjUfXidViUZGu2F1MO4T3XwZ1et0hb2++BgLfhyJwy44BGB/yx80ABx8hg=="
     },
     "async-stacktrace": {
       "version": "0.0.2",

src/package.json

@@ -30,7 +30,7 @@
     }
   ],
   "dependencies": {
-    "async": "^3.2.0",
+    "async": "^3.2.1",
     "async-stacktrace": "0.0.2",
     "channels": "0.0.4",
     "clean-css": "4.2.3",