composer.json: Drop symfony/polyfill-php80

#235

Author: reedy

composer.json

@@ -41,7 +41,6 @@
 		"php": ">=8.0",
 		"data-values/data-values": "^3.0|^2.0|^1.0|~0.1",
 		"data-values/interfaces": "^1.1.0",
-		"symfony/polyfill-php80": "^1.18.1"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "^9.4.1",