chore: update AdminJS to v6

BREAKING CHANGE: This package version should be used with AdminJS v6

Author: dziraf

package.json

@@ -21,7 +21,7 @@
   "author": "Wojciech Krysiak",
   "license": "MIT",
   "peerDependencies": {
-    "adminjs": ">=5.0.0",
+    "adminjs": ">=6.0.0",
     "sequelize": ">=4"
   },
   "husky": {
@@ -40,7 +40,7 @@
     "@types/sinon-chai": "^3.2.4",
     "@typescript-eslint/eslint-plugin": "^3.7.0",
     "@typescript-eslint/parser": "^3.7.0",
-    "adminjs": "^5.0.0",
+    "adminjs": "^6.0.0",
     "chai": "^4.3.4",
     "eslint": "^7.5.0",
     "eslint-config-airbnb": "^18.2.0",