bump version to 6.4.2

OKTA-488924
<<<Jenkins Check-In of Tested SHA: 8b2980f for eng_productivity_ci_bot_okta@okta.com>>>
Artifact: okta-auth-js
Files changed count: 3
PR Link: "#1180"

package.json

@@ -2,7 +2,7 @@
   "private": true,
   "name": "@okta/okta-auth-js",
   "description": "The Okta Auth SDK",
-  "version": "6.4.1",
+  "version": "6.4.2",
   "homepage": "https://github.com/okta/okta-auth-js",
   "license": "Apache-2.0",
   "main": "build/cjs/index.js",