Run typechain in postcompile instead of postinstall

package.json

@@ -68,7 +68,7 @@
     "lint": "pnpm lint:sol && pnpm lint:ts && pnpm prettier:check",
     "lint:sol": "solhint --max-warnings 0 \"contracts/**/*.sol\"",
     "lint:ts": "eslint --ignore-path ./.eslintignore --ext .js,.ts .",
-    "postinstall": "pnpm typechain",
+    "postcompile": "pnpm typechain",
     "prettier:check": "prettier --check \"**/*.{js,json,md,sol,ts,yml}\"",
     "prettier:write": "prettier --write \"**/*.{js,json,md,sol,ts,yml}\"",
     "task:deployGreeter": "hardhat task:deployGreeter",