Update dependency del to v6 (#622)

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

Author: renovate[bot]

package-lock.json

@@ -41,7 +41,7 @@
     "chalk": "4.1.0",
     "chromedriver": "85.0.1",
     "coveralls": "3.1.0",
-    "del": "5.1.0",
+    "del": "6.0.0",
     "eslint": "7.9.0",
     "eslint-config-airbnb": "18.2.0",
     "eslint-plugin-import": "2.22.0",