[meta] use prepublishOnly script for npm 7+

Author: ljharb

package.json

@@ -19,7 +19,8 @@
 		"./package.json": "./package.json"
 	},
 	"scripts": {
-		"prepublish": "safe-publish-latest",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"prepublishOnly": "safe-publish-latest",
 		"lint": "eslint --ext=.js,.mjs .",
 		"pretest": "npm run lint",
 		"tests-only": "nyc tape 'test/*'",