chore: remove pretest script as pnpm does not run it

The script can cause confusion as it has no effect with pnpm
see https://pnpm.io/cli/run#differences-with-npm-run

Author: ludofischer

package.json

@@ -20,7 +20,6 @@
     "prepare": "pnpm run build && tsc",
     "build": "jison src/parser.jison -o src/parser.js",
     "lint": "eslint . && tsc",
-    "pretest": "pnpm run build",
     "test": "uvu test"
   },
   "author": "Andy Jansson",