composer.json: Update php_codesniffer to 3.6.1

Author: reedy

composer.json

@@ -21,7 +21,7 @@
         "mediawiki/mediawiki-phan-config": "0.10.6",
         "php-parallel-lint/php-parallel-lint": "~1.3.1",
         "phpunit/phpunit": "^8.5||^9.0",
-        "squizlabs/php_codesniffer": "~3.5.8"
+        "squizlabs/php_codesniffer": "~3.6.1"
     },
     "autoload": {
         "psr-4": {