chore(package): update mkdirp to version 1.0.3

Closes scratchfoundation#5396

Author: greenkeeper[bot]

package.json

@@ -78,7 +78,7 @@
     "lodash.pick": "4.4.0",
     "lodash.throttle": "4.0.1",
     "minilog": "3.1.0",
-    "mkdirp": "^0.5.1",
+    "mkdirp": "^1.0.3",
     "omggif": "1.0.9",
     "papaparse": "5.1.1",
     "postcss-import": "^12.0.0",