Bump dealerdirect installer to ^1.0 for PHP 8 and Composer 2 support

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: joehoyle

composer.json

@@ -16,7 +16,7 @@
 	"require-dev": {
 		"squizlabs/php_codesniffer": "^3.3.1",
 		"wp-coding-standards/wpcs": "^2.1.1",
-		"dealerdirect/phpcodesniffer-composer-installer": "^0.5.0",
+		"dealerdirect/phpcodesniffer-composer-installer": "^1.0",
 		"phpcompatibility/phpcompatibility-wp": "^2.0",
 		"phpunit/phpunit": "^9.6"
 	},