deps: update mkdirp requirement from ^1.0.3 to ^1.0.4 (#73)

Updates the requirements on [mkdirp](https://github.com/isaacs/node-mkdirp) to permit the latest version.
- [Release notes](https://github.com/isaacs/node-mkdirp/releases)
- [Changelog](https://github.com/isaacs/node-mkdirp/blob/main/CHANGELOG.md)
- [Commits](isaacs/node-mkdirp@v1.0.3...v1.0.4)

---
updated-dependencies:
- dependency-name: mkdirp
  dependency-type: direct:production
...

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package.json

@@ -57,7 +57,7 @@
     "minipass-collect": "^1.0.2",
     "minipass-flush": "^1.0.5",
     "minipass-pipeline": "^1.2.4",
-    "mkdirp": "^1.0.3",
+    "mkdirp": "^1.0.4",
     "p-map": "^4.0.0",
     "promise-inflight": "^1.0.1",
     "rimraf": "^3.0.2",