chore(deps): bump undici from 6.21.0 to 6.21.1 in /example

Bumps [undici](https://github.com/nodejs/undici) from 6.21.0 to 6.21.1.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.21.0...v6.21.1)

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

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

Author: dependabot[bot]

example/.yarn/install-state.gz

@@ -11526,9 +11526,9 @@ __metadata:
   linkType: hard
 
 "undici@npm:^6.18.2":
-  version: 6.21.0
-  resolution: "undici@npm:6.21.0"
-  checksum: 10c0/afa9bde6dcf8e0f5cf1ff2fa977ba73dd5510299ddfca0e1f37ff326554172ae31cb3d4a40b5a729601be1f21b96a2684f974d74dab53f9b6930fd47d1949246
+  version: 6.21.1
+  resolution: "undici@npm:6.21.1"
+  checksum: 10c0/d604080e4f8db89b35a63b483b5f96a5f8b19ec9f716e934639345449405809d2997e1dd7212d67048f210e54534143384d712bd9075e4394f0788895ef9ca8e
   languageName: node
   linkType: hard