Changelog and readme.txt edits. (#45442)

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/18381306334

Upstream-Ref: Automattic/jetpack@63ba594

Author: tbradsha

composer.json

@@ -6,7 +6,7 @@
 	"require": {
 		"php": ">=7.2",
 		"automattic/jetpack-assets": "^4.3.10",
-		"automattic/jetpack-connection": "^6.18.13-alpha",
+		"automattic/jetpack-connection": "^6.18.13",
 		"automattic/jetpack-redirect": "^3.0.9",
 		"automattic/jetpack-status": "^6.0.4"
 	},