Changelog and readme.txt edits. (#40452)

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/12168439567

Upstream-Ref: Automattic/jetpack@0068d77

Author: tbradsha

composer.json

@@ -5,7 +5,7 @@
 	"license": "GPL-2.0-or-later",
 	"require": {
 		"php": ">=7.2",
-		"automattic/jetpack-connection": "^6.1.1-alpha",
+		"automattic/jetpack-connection": "^6.1.1",
 		"automattic/jetpack-autoloader": "^5.0.0",
 		"automattic/jetpack-config": "^3.0.0",
 		"automattic/jetpack-assets": "^4.0.1",