[meta] use prepublishOnly script for npm 7+

Author: ljharb

package.json

@@ -17,7 +17,8 @@
     "tape": "^5.2.2"
   },
   "scripts": {
-    "prepublish": "safe-publish-latest",
+    "prepublish": "not-in-publish || npm run prepublishOnly",
+    "prepublishOnly": "safe-publish-latest",
     "pretest": "npm run lint",
     "lint": "eslint .",
     "test": "npm run tests-only",