Bump undici from 4.9.5 to 5.5.1

Bumps [undici](https://github.com/nodejs/undici) from 4.9.5 to 5.5.1.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v4.9.5...v5.5.1)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -122,7 +122,7 @@
     "ts-node": "^8.4.1",
     "typescript": "^4.4.3",
     "umd-compat-loader": "^2.1.2",
-    "undici": "^4.9.5",
+    "undici": "^5.5.1",
     "unirest": "^0.6.0",
     "webpack": "^4.46.0",
     "webpack-cli": "^3.3.9",