fix(packageManager): bump pnpm@11.0.8 → pnpm@11.1.2

The pnpm 11.1.2 cascade landed in external-tools.json + cascade-internal
chain (registry CI downloads 11.1.2), but the root packageManager field
was still pinned at 11.0.8. pnpm 11.1.2 then refused to run with:

  [ERROR] This project is configured to use 11.0.8 of pnpm. Your
  current pnpm is v11.1.2

Bring packageManager in line with the installed binary.

Author: jdalton

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@socketregistry/monorepo",
   "version": "1.0.0",
-  "packageManager": "pnpm@11.0.8",
+  "packageManager": "pnpm@11.1.2",
   "private": true,
   "license": "MIT",
   "description": "Monorepo for Socket.dev optimized package overrides",