Update dependency webdriver-manager to v12.1.8

Author: renovate-bot

package-lock.json

@@ -10,7 +10,7 @@
     "ava": "3.15.0",
     "chromedriver": "87.0.5",
     "selenium-webdriver": "4.0.0-alpha.8",
-    "webdriver-manager": "12.1.7"
+    "webdriver-manager": "12.1.8"
   },
   "description": "Selenium-WebDriver end-to-end test automation boilerplate. Using ES Modules, Babel and AVA.",
   "devDependencies": {