fix: upgrade casbin from 4.5.0 to 4.7.2

Snyk has created this PR to upgrade casbin from 4.5.0 to 4.7.2.

See this package in NPM:
https://www.npmjs.com/package/casbin

See this project in Snyk:
https://app.snyk.io/org/revjtanton/project/09a1968e-7b01-4032-9063-82f2e99f843e?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -37,7 +37,7 @@
   "dependencies": {
     "@babel/core": "7.9.6",
     "@babel/node": "7.8.7",
-    "casbin": "4.5.0",
+    "casbin": "4.7.2",
     "casbin-sequelize-adapter": "2.1.0",
     "chai": "4.2.0",
     "cors": "2.8.5",