[2.x] Upgrade to pnpm 12 and resolve vulnerabilities

CONTRIBUTING.md

@@ -4,7 +4,7 @@ Thank you for your interest in contributing to Laravel Echo! Your contributions
 
 Echo is maintained as a monorepo using [pnpm workspaces](https://pnpm.io/workspaces). Below you'll find an overview of the repository and how to get your development environment running.
 
-> **Note:** You'll need **pnpm version 10 or higher**. If you're unsure which version you have, run `pnpm -v`.
+> **Note:** You'll need **pnpm version 12 or higher**. If you're unsure which version you have, run `pnpm -v`.
 
 ## Repository Overview
 

package.json

@@ -9,7 +9,7 @@
     "author": {
         "name": "Taylor Otwell"
     },
-    "packageManager": "pnpm@11.22.0",
+    "packageManager": "pnpm@12.3.4",
     "scripts": {
         "test": "pnpm -r --parallel --no-sort --if-present run test",
         "typecheck": "pnpm -r --parallel --no-sort --if-present run typecheck",