Update wikibase-codesniffer to v1.2.0

Author: itamargiv

composer.json

@@ -18,7 +18,7 @@
 	},
 	"require-dev": {
 		"phpunit/phpunit": "^8.5.3",
-		"wikibase/wikibase-codesniffer": "^1.1.0"
+		"wikibase/wikibase-codesniffer": "^1.2.0"
 	},
 	"autoload-dev": {
 		"psr-4": {