chore(deps-dev): bump undici from 6.19.8 to 6.21.1

Bumps [undici](https://github.com/nodejs/undici) from 6.19.8 to 6.21.1.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.19.8...v6.21.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -61,6 +61,6 @@
     "tmp-promise": "3.0.3",
     "typescript": "5.5.4",
     "tsx": "4.19.1",
-    "undici": "6.19.8"
+    "undici": "6.21.1"
   }
 }