chore(deps): update dependency mkdirp to ^0.5.6

Author: renovate[bot]

package.json

@@ -137,7 +137,7 @@
     "husky": "^4.3.5",
     "lnfs-cli": "^2.1.0",
     "lodash": "^4.17.20",
-    "mkdirp": "^0.5.1",
+    "mkdirp": "^0.5.6",
     "mocha": "^6.1.4",
     "nyc": "^13.3.0",
     "parcel-bundler": "^1.12.4",

yarn.lock

@@ -4748,13 +4748,20 @@ mixin-deep@^1.2.0:
     for-in "^1.0.2"
     is-extendable "^1.0.1"
 
-mkdirp@0.5.1, mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.1:
+mkdirp@0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   integrity sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=
   dependencies:
     minimist "0.0.8"
 
+mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@^0.5.6, mkdirp@~0.5.1:
+  version "0.5.6"
+  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.6.tgz#7def03d2432dcae4ba1d611445c48396062255f6"
+  integrity sha512-FP+p8RB8OWpF3YZBCrP5gtADmtXApB5AMLn+vdyA+PyxCjrCs00mjyUozssO33cwDeT3wNGdLxJ5M//YqtHAJw==
+  dependencies:
+    minimist "^1.2.6"
+
 mocha@^6.1.4:
   version "6.1.4"
   resolved "https://registry.yarnpkg.com/mocha/-/mocha-6.1.4.tgz#e35fada242d5434a7e163d555c705f6875951640"