Suppress deprecated warnings

Noodlehaus\AbstractConfig is currently not compatible with its
interfaces because it does not declare their return types. In order to
get a working version of php-semver-checker without warnings we will
suppress those warnings until we can replace the hassankhan/config with
a different one that is also compatible with PHP 8+.

src/PHPSemVerChecker/Console/Application.php

@@ -23,6 +23,9 @@ class Application extends SymfonyApplication
 	public function __construct()
 	{
 		parent::__construct('PHP Semantic Versioning Checker by Tom Rochette', self::VERSION);
+
+		// Suppress deprecated warnings
+		error_reporting(E_ALL ^E_DEPRECATED);
 	}
 
 	/**