chore(deps): update pnpm to v9 (#1575)

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

Author: renovate[bot]

package.json

@@ -2,7 +2,7 @@
   "name": "guild-website-monorepo",
   "license": "MIT",
   "private": true,
-  "packageManager": "pnpm@8.15.7",
+  "packageManager": "pnpm@9.0.6",
   "engines": {
     "node": ">=21.6",
     "pnpm": ">=8.15.0"