Changelogger: Update tests to use addCommand() instead of deprecated add() method (#46126)

* change to addCommand due to deprecation on add method

* changelogger changelog

* sadly, older versions complaint and fail, which triggers a huge cascade of failing checks, ignore for now

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/19744329198

Upstream-Ref: Automattic/jetpack@5abd82a

Author: CGastrell

composer.json

@@ -16,7 +16,7 @@
 	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "^4.0.0",
-		"automattic/jetpack-changelogger": "^6.0.9",
+		"automattic/jetpack-changelogger": "^6.0.10-alpha",
 		"automattic/phpunit-select-config": "^1.0.3"
 	},
 	"autoload": {