Update dependency sinon to v7.4.0 (#486)

Author: renovate[bot]

package-lock.json

@@ -50,7 +50,7 @@
     "portfinder": "1.0.21",
     "selenium-assistant": "5.4.0",
     "semver": "6.3.0",
-    "sinon": "7.3.2",
+    "sinon": "7.4.0",
     "which": "1.3.1"
   },
   "engines": {