chore: Bump mocha to v8.1.3

Author: nschonni

package.json

@@ -76,7 +76,7 @@
     "eslint": "^7.10.0",
     "fs-extra": "^0.30.0",
     "istanbul": "^0.4.2",
-    "mocha": "^3.1.2",
+    "mocha": "^8.1.3",
     "mocha-lcov-reporter": "^1.2.0",
     "rimraf": "^2.5.2",
     "unique-temp-dir": "^1.0.0"