Update dependency mocha to v8.1.3 (#617)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package-lock.json

@@ -48,7 +48,7 @@
     "geckodriver": "1.20.0",
     "istanbul": "0.4.5",
     "mkdirp": "1.0.4",
-    "mocha": "8.1.2",
+    "mocha": "8.1.3",
     "mocha-lcov-reporter": "1.3.0",
     "portfinder": "1.0.28",
     "selenium-assistant": "5.4.0",