Update dependency slevomat/coding-standard to v7

Author: renovate-bot

build-cs/composer.json

@@ -5,7 +5,7 @@
 "require-dev": {
 "consistence-community/coding-standard": "^3.11",
 "dealerdirect/phpcodesniffer-composer-installer": "^0.7.1",
-"slevomat/coding-standard": "^6.4.1"
+"slevomat/coding-standard": "^7.0.0"
 },
 "config": {
 "allow-plugins": {