[Tests] switch to npm audit from aud

package.json

@@ -35,7 +35,7 @@
 		"pretest": "npm run lint",
 		"test": "npm run tests-only && npm run test:ses",
 		"test:ses": "node test/ses-compat",
-		"posttest": "aud --production",
+		"posttest": "npx npm@'>= 10.2' audit --production",
 		"tests-only": "nyc node --stack-size=5120 test",
 		"lint": "eslint .",
 		"eccheck": "eclint check $(git ls-files | xargs find 2> /dev/null | grep -vE 'node_modules|\\.git')"