Bump undici (#1129)

Bumps [undici](https://github.com/nodejs/undici) from 5.25.3 to 5.26.4.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/compare/v5.25.3...v5.26.4)

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

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

src/testing/userload-generator/AzureFunctions/RegionalLoadGenerator/package-lock.json

@@ -214,9 +214,9 @@
       }
     },
     "node_modules/undici": {
-      "version": "5.25.3",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-5.25.3.tgz",
-      "integrity": "sha512-7lmhlz3K1+IKB6IUjkdzV2l0jKY8/0KguEMdEpzzXCug5pEGIp3DxUg0DEN65DrVoxHiRKpPORC/qzX+UglSkQ==",
+      "version": "5.26.4",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-5.26.4.tgz",
+      "integrity": "sha512-OG+QOf0fTLtazL9P9X7yqWxQ+Z0395Wk6DSkyTxtaq3wQEjIroVe7Y4asCX/vcCxYpNGMnwz8F0qbRYUoaQVMw==",
       "dependencies": {
         "@fastify/busboy": "^2.0.0"
       },