Bump undici from 6.19.4 to 6.21.3

Bumps [undici](https://github.com/nodejs/undici) from 6.19.4 to 6.21.3.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.19.4...v6.21.3)

---
updated-dependencies:
- dependency-name: undici
  dependency-version: 6.21.3
  dependency-type: indirect
...

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

Author: dependabot[bot]

yarn.lock

@@ -6000,9 +6000,9 @@ undici-types@~5.26.4:
   integrity sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==
 
 undici@^6.14.1:
-  version "6.19.4"
-  resolved "https://registry.yarnpkg.com/undici/-/undici-6.19.4.tgz#5ec3b191699a1678ee0aa9ed14e443a682d0f7a8"
-  integrity sha512-i3uaEUwNdkRq2qtTRRJb13moW5HWqviu7Vl7oYRYz++uPtGHJj+x7TGjcEuwS5Mt2P4nA0U9dhIX3DdB6JGY0g==
+  version "6.21.3"
+  resolved "https://registry.yarnpkg.com/undici/-/undici-6.21.3.tgz#185752ad92c3d0efe7a7d1f6854a50f83b552d7a"
+  integrity sha512-gBLkYIlEnSp8pFbT64yFgGE6UIB9tAkhukC23PmMDCe5Nd+cRqKxSjw5y54MK2AZMgZfJWMaNE4nYUHgi1XEOw==
 
 unenv@^2.0.0-rc.12, unenv@^2.0.0-rc.17:
   version "2.0.0-rc.17"