build: update pnpm to v9.15.9 (#31088)

See associated pull request for more information.

(cherry picked from commit cc4ba24)

Author: angular-robot

package.json

@@ -8,7 +8,7 @@
     "url": "https://github.com/angular/components.git"
   },
   "license": "MIT",
-  "packageManager": "pnpm@9.15.6",
+  "packageManager": "pnpm@9.15.9",
   "engines": {
     "npm": "Please use pnpm instead of NPM to install dependencies",
     "yarn": "Please use pnpm instead of Yarn to install dependencies",