chore: allow pnpm >=9 in engine constraints

Support both pnpm 9 and 10 for local development.

Author: lutter

package.json

@@ -13,7 +13,7 @@
   "private": true,
   "engines": {
     "node": ">=20.0.0",
-    "pnpm": "9"
+    "pnpm": ">=9"
   },
   "scripts": {
     "build": "pnpm --filter=@graphprotocol/graph-* build",