chore(deps): update pnpm to v12 (#629)

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

Author: renovate[bot]

package.json

@@ -21,7 +21,7 @@
     "website:build": "cross-env BABEL_TARGET=examples NODE_ENV=production webpack",
     "website:redirect": "cp -R examples/src/example examples/dist"
   },
-  "packageManager": "pnpm@11.25.0",
+  "packageManager": "pnpm@12.3.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/reactjs/react-tabs.git"