[Dev Deps] pin psl due to breaking change in a minor version

See lupomontero/psl#341

Author: ljharb

package.json

@@ -43,6 +43,7 @@
     "npmignore": "^0.3.1",
     "object.entries": "^1.1.8",
     "object.fromentries": "^2.0.8",
+    "psl": "=1.9.0",
     "rimraf": "^2.7.1",
     "safe-publish-latest": "^2.0.0"
   },