[meta] use prepublishOnly script for npm 7+

Author: ljharb

package.json

@@ -22,7 +22,8 @@
     "flow": "if [ ! -e ./.flowconfig ]; then echo \"Could not find .flowconfig\"; else flow; test $? -eq 0 -o $? -eq 2; fi",
     "lint:fix": "npm run lint -- --fix",
     "lint": "eslint  --config .eslintrc src __tests__ __mocks__ scripts",
-    "prepublish": "safe-publish-latest && not-in-publish || (npm run lint && npm run flow && npm run jest && npm run build)",
+    "prepublish": "safe-publish-latest && not-in-publish || npm run prepublishOnly",
+    "prepublishOnly": "npm run lint && npm run flow && npm run jest && npm run build",
     "pretest": "npm run lint:fix && npm run flow",
     "test": "npm run jest",
     "posttest": "aud --production",