build: alias wpcs git branch

Change package version to allow simple package installation by clients
without requiring `minimum-stability` config in composer.json.

- <https://getcomposer.org/doc/articles/aliases.md#require-inline-alias

>

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

composer.json

@@ -16,7 +16,7 @@
 		"php": ">=7.0",
 		"dealerdirect/phpcodesniffer-composer-installer": "^1",
 		"squizlabs/php_codesniffer": "^3.6",
-		"wp-coding-standards/wpcs": "dev-develop",
+		"wp-coding-standards/wpcs": "dev-develop as 2.4.x-dev",
 		"phpcompatibility/phpcompatibility-wp": "^2.1.1"
 	},
 	"require-dev": {