fix(deps): switch ppef from local link to npm registry

Replace `"ppef": "link:../ppef"` with `"ppef": "1.2.0"` so the
dependency resolves in CI where the sibling directory does not exist.

Author: Mearman

package.json

@@ -115,6 +115,6 @@
   },
   "dependencies": {
     "fflate": "^0.8.2",
-    "ppef": "link:../ppef"
+    "ppef": "1.2.0"
   }
 }