Update pnpm to v11.12.0 (#1909)

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

Author: renovate[bot]

package.json

@@ -5,7 +5,7 @@
   "author": "Ghost Foundation",
   "license": "MIT",
   "type": "module",
-  "packageManager": "pnpm@11.11.0",
+  "packageManager": "pnpm@11.13.1",
   "engines": {
     "node": ">=22.21.1"
   },