fix: upgrade debug from 4.3.2 to 4.3.3 (#91)

Snyk has created this PR to upgrade debug from 4.3.2 to 4.3.3.

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

See this project in Snyk:
https://app.snyk.io/org/acinader/project/69405056-d920-432d-be2c-c0fc4c6c4c57?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -18,7 +18,7 @@
     "url": "https://github.com/parse-community/node-apn.git"
   },
   "dependencies": {
-    "debug": "4.3.2",
+    "debug": "4.3.3",
     "jsonwebtoken": "8.5.1",
     "node-forge": "1.0.0",
     "verror": "1.10.1"