packages: Use range dep for changelogger (#19304)

This makes the release process a bit more straightforward, as we won't
need to fix the ".x-dev" when releasing the packages.

Also enforce via CI that packages must use range deps for each other.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/690222283

composer.json

@@ -7,7 +7,7 @@
 	"require-dev": {
 		"brain/monkey": "2.6.0",
 		"yoast/phpunit-polyfills": "0.2.0",
-		"automattic/jetpack-changelogger": "1.1.x-dev"
+		"automattic/jetpack-changelogger": "^1.1"
 	},
 	"autoload": {
 		"classmap": [