chore: bump which from 5.0.0 to 6.0.0 (#3348)

Bumps [which](https://github.com/npm/node-which) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/npm/node-which/releases)
- [Changelog](https://github.com/npm/node-which/blob/main/CHANGELOG.md)
- [Commits](npm/node-which@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: which
  dependency-version: 6.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/kad-dht/package.json

@@ -101,7 +101,7 @@
     "protons": "^7.7.0",
     "sinon": "^21.0.0",
     "sinon-ts": "^2.0.0",
-    "which": "^5.0.0"
+    "which": "^6.0.0"
   },
   "browser": {
     "./dist/src/routing-table/generated-prefix-list.js": "./dist/src/routing-table/generated-prefix-list-browser.js"