build(deps-dev): bump undici from 6.20.1 to 6.21.0 (#3499)

Bumps [undici](https://github.com/nodejs/undici) from 6.20.1 to 6.21.0.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/compare/v6.20.1...v6.21.0)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package-lock.json

@@ -38,7 +38,7 @@
         "prettier": "^3.3.3",
         "ts-jest": "^29.2.5",
         "typescript": "^5.6.3",
-        "undici": "^6.20.1"
+        "undici": "^6.21.0"
       }
     },
     "node_modules/@actions/core": {
@@ -7778,11 +7778,10 @@
       }
     },
     "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": "6.21.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.21.0.tgz",
+      "integrity": "sha512-BUgJXc752Kou3oOIuU1i+yZZypyZRqNPW0vqoMPl8VaoalSfeR0D8/t4iAS3yirs79SSMTxTag+ZC86uswv+Cw==",
       "dev": true,
-      "license": "MIT",
       "engines": {
         "node": ">=18.17"
       }

package.json

@@ -58,6 +58,6 @@
     "prettier": "^3.3.3",
     "ts-jest": "^29.2.5",
     "typescript": "^5.6.3",
-    "undici": "^6.20.1"
+    "undici": "^6.21.0"
   }
 }