Update slevomat/coding-standard to ^8.0

Author: herndlm

build-cs/composer.json

@@ -1,8 +1,8 @@
 {
 	"require-dev": {
-		"consistence-community/coding-standard": "^3.10",
+		"consistence-community/coding-standard": "^3.11",
 		"dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
-		"slevomat/coding-standard": "^7.0"
+		"slevomat/coding-standard": "^8.0"
 	},
 	"config": {
 		"allow-plugins": {