update ps/image-optimizer dependency (#3)

Author: codemasher

composer.json

@@ -19,7 +19,7 @@
 		"php": "^7.4 || ^8.0",
 		"ext-imagick": "*",
 		"chillerlan/php-settings-container": "^2.1",
-		"ps/image-optimizer": "^1.2",
+		"ps/image-optimizer": "^2.0",
 		"psr/log": "^1.1"
 	},
 	"require-dev": {