Fix Github Actions failure

Fix lowest version of phpcs

Author: ihor-sviziev

composer.json

@@ -21,7 +21,7 @@
     "require-dev": {
         "phpunit/phpunit": "^6.5.0",
         "ext-dom": "*",
-        "squizlabs/php_codesniffer": "^3.5"
+        "squizlabs/php_codesniffer": "^3.5.1"
     },
     "autoload": {
         "psr-4": {