Remove mkdirp dependency.

Author: Robert Jackson

package.json

@@ -41,7 +41,6 @@
     "debug": "^4.1.0",
     "lodash.defaultsdeep": "^4.6.1",
     "matcher-collection": "^2.0.1",
-    "mkdirp": "^0.5.0",
     "source-map-url": "^0.4.0",
     "symlink-or-copy": "^1.3.1",
     "terser": "^5.3.0",

yarn.lock

@@ -4609,7 +4609,7 @@ mixin-deep@^1.2.0:
     for-in "^1.0.2"
     is-extendable "^1.0.1"
 
-mkdirp@^0.5.0, mkdirp@^0.5.1:
+mkdirp@^0.5.1:
   version "0.5.1"
   resolved "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies: