Upgrade: Bump which from 5.0.0 to 6.0.0

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:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -44,7 +44,7 @@
     "pidtree": "^0.6.0",
     "read-package-json-fast": "^4.0.0",
     "shell-quote": "^1.7.3",
-    "which": "^5.0.0"
+    "which": "^6.0.0"
   },
   "devDependencies": {
     "auto-changelog": "^2.2.0",