[pkg] Update mocha to version 8.0.1

Author: lpinca

package.json

@@ -25,7 +25,7 @@
     "node-gyp-build": "^4.2.0"
   },
   "devDependencies": {
-    "mocha": "^7.2.0",
+    "mocha": "^8.0.1",
     "prebuildify": "^4.0.0"
   }
 }