build(deps-dev): bump undici from 6.20.1 to 6.21.1 (#728)

Bumps [undici](https://github.com/nodejs/undici) from 6.20.1 to 6.21.1.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.20.1...v6.21.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -10402,9 +10402,9 @@
       "license": "MIT"
     },
     "node_modules/undici": {
-      "version": "6.20.1",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-6.20.1.tgz",
-      "integrity": "sha512-AjQF1QsmqfJys+LXfGTNum+qw4S88CojRInG/6t31W/1fk6G59s92bnAvGz5Cmur+kQv2SURXEvvudLmbrE8QA==",
+      "version": "6.21.1",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.21.1.tgz",
+      "integrity": "sha512-q/1rj5D0/zayJB2FraXdaWxbhWiNKDvu8naDT2dl1yTlvJp4BLtOcp2a5BvgGNQpYYJzau7tf1WgKv3b+7mqpQ==",
       "dev": true,
       "license": "MIT",
       "engines": {