Merge pull request #46 from httptoolkit/dependabot/npm_and_yarn/undici-5.5.1

Bump undici test dependency from 4.9.5 to 5.5.1

Author: pimterry

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",