Bump PHPUnit a bit

Author: sanmai

composer.json

@@ -34,7 +34,7 @@
     "require-dev": {
         "friendsofphp/php-cs-fixer": "~2.2.20 || ~2.19.0",
         "json-schema/json-schema-test-suite": "1.2.0",
-        "phpunit/phpunit": ">=4.8.35 <10",
+        "phpunit/phpunit": ">=4.8.36 <10",
         "sanmai/phpunit-legacy-adapter": "^6.4 || ^8.2.1",
         "phpspec/prophecy-phpunit": ">=1.0"
     },