Update dependency slevomat/coding-standard to v7

Author: renovate-bot

.gitignore

@@ -1,4 +1,4 @@
 /tests/tmp
 /vendor
-composer.lock
+/composer.lock
 .phpunit.result.cache

build-cs/.gitignore

@@ -1,2 +1 @@
-/composer.lock
 /vendor

build-cs/composer.json

@@ -2,7 +2,7 @@
 	"require-dev": {
 		"consistence-community/coding-standard": "^3.10",
 		"dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
-		"slevomat/coding-standard": "^6.4"
+		"slevomat/coding-standard": "^7.0"
 	},
 	"config": {
 		"allow-plugins": {