update readme/changelog for v6 (#2311)

Author: ericsciple

CHANGELOG.md

@@ -1,8 +1,17 @@
 # Changelog
 
+## V6.0.0
+* Persist creds to a separate file by @ericsciple in https://github.com/actions/checkout/pull/2286
+* Update README to include Node.js 24 support details and requirements by @salmanmkc in https://github.com/actions/checkout/pull/2248
+
+## V5.0.1
+* Port v6 cleanup to v5 by @ericsciple in https://github.com/actions/checkout/pull/2301
+
 ## V5.0.0
 * Update actions checkout to use node 24 by @salmanmkc in https://github.com/actions/checkout/pull/2226
 
+## V4.3.1
+* Port v6 cleanup to v4 by @ericsciple in https://github.com/actions/checkout/pull/2305
 
 ## V4.3.0
 * docs: update README.md by @motss in https://github.com/actions/checkout/pull/1971

README.md

@@ -1,6 +1,6 @@
 [![Build and Test](https://github.com/actions/checkout/actions/workflows/test.yml/badge.svg)](https://github.com/actions/checkout/actions/workflows/test.yml)
 
-# Checkout v6-beta
+# Checkout v6
 
 ## What's new