[Tests] replace aud with npm audit

Author: ljharb

package.json

@@ -9,7 +9,7 @@
 		"prepublish": "not-in-publish || npm run prepublishOnly",
 		"pretest": "npm run lint",
 		"test": "npm run tests-only",
-		"posttest": "aud --production",
+		"posttest": "npx npm@\">= 10.2\" audit --production",
 		"tests-only": "nyc tape 'test/**/*.js'",
 		"lint": "eslint --ext=js,mjs ."
 	},
@@ -30,7 +30,6 @@
 	},
 	"devDependencies": {
 		"@ljharb/eslint-config": "^21.1.0",
-		"aud": "^2.0.3",
 		"eslint": "=8.8.0",
 		"nyc": "^10.3.2",
 		"safe-publish-latest": "^2.0.0",