chore(deps): update pnpm to v12

Author: renovate[bot]

package.json

@@ -24,5 +24,5 @@
     "rstack": "workspace:*",
     "typescript": "catalog:"
   },
-  "packageManager": "pnpm@11.25.0"
+  "packageManager": "pnpm@12.3.4"
 }

packages/create-rstack/template-turborepo/package.json

@@ -16,5 +16,5 @@
     "turbo": "^2.10.12",
     "typescript": "^7.0.2"
   },
-  "packageManager": "pnpm@11.25.0"
+  "packageManager": "pnpm@12.3.4"
 }