Update dependency mkdirp to v1.0.4 (#570)

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

Author: renovate[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "eslint-plugin-import": "2.20.2",
     "geckodriver": "1.19.1",
     "istanbul": "0.4.5",
-    "mkdirp": "1.0.3",
+    "mkdirp": "1.0.4",
     "mocha": "7.1.1",
     "mocha-lcov-reporter": "1.3.0",
     "portfinder": "1.0.25",