Pin dependency which to 6.0.1 (#2134)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -88,7 +88,7 @@
     "tail": "2.2.6",
     "tough-cookie": "6.0.1",
     "validator": "7.2.0",
-    "which": "^6.0.1",
+    "which": "6.0.1",
     "yargs": "17.7.2",
     "yarn": "1.22.22"
   },