Bump undici from 6.21.1 to 6.21.3 in /web-ui

Bumps [undici](https://github.com/nodejs/undici) from 6.21.1 to 6.21.3.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.21.1...v6.21.3)

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

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

Author: dependabot[bot]

web-ui/yarn.lock

@@ -8383,9 +8383,9 @@ unbox-primitive@^1.1.0:
     which-boxed-primitive "^1.1.1"
 
 undici@^6.19.5:
-  version "6.21.1"
-  resolved "https://registry.npmjs.org/undici/-/undici-6.21.1.tgz"
-  integrity sha512-q/1rj5D0/zayJB2FraXdaWxbhWiNKDvu8naDT2dl1yTlvJp4BLtOcp2a5BvgGNQpYYJzau7tf1WgKv3b+7mqpQ==
+  version "6.21.3"
+  resolved "https://registry.yarnpkg.com/undici/-/undici-6.21.3.tgz#185752ad92c3d0efe7a7d1f6854a50f83b552d7a"
+  integrity sha512-gBLkYIlEnSp8pFbT64yFgGE6UIB9tAkhukC23PmMDCe5Nd+cRqKxSjw5y54MK2AZMgZfJWMaNE4nYUHgi1XEOw==
 
 unicorn-magic@^0.3.0:
   version "0.3.0"