Require Twig ^3.18 instead of ^3.19 for PHP 8.0 compatibility

Author: Mike-Hermans

composer.json

@@ -36,12 +36,12 @@
 		]
 	},
 	"require" : {
-		"twig/twig":"^3.19",
-		"php":">=8.0",
+		"php":"^8.0",
+		"twig/twig": "^3.18",
 		"twig/string-extra": "^3.19",
 		"twig/intl-extra": "^3.19",
 		"twig/html-extra": "^3.19",
-		"twig/markdown-extra": "^3.19"
+		"twig/markdown-extra": "^3.18"
 	},
 	"require-dev": {
 		"wp-coding-standards/wpcs": "^2.1",