[dev][vendor] Upgrade 'doctrine/coding-standard' to ^9.0

- Disable "mixed" type hint for backward compatibility

Author: dsavina

composer.json

@@ -28,7 +28,7 @@
     "phpstan/phpstan": "^0.12.14",
     "php-coveralls/php-coveralls": "^2.1.0",
     "symfony/translation": "^4",
-    "doctrine/coding-standard": "^7.0"
+    "doctrine/coding-standard": "^9.0"
   },
   "scripts": {
     "phpstan": "phpstan analyse src/ -c phpstan.neon --level=7 --no-progress",

phpcs.xml.dist

@@ -49,4 +49,17 @@
             <property name="enableNativeTypeHint" value="false"/>
         </properties>
     </rule>
+
+    <!-- Disable "mixed" type hints only available since PHP 8.0 -->
+    <rule ref="SlevomatCodingStandard.TypeHints.ParameterTypeHint">
+        <properties>
+            <property name="enableMixedTypeHint" value="false"/>
+        </properties>
+    </rule>
+
+    <rule ref="SlevomatCodingStandard.TypeHints.ReturnTypeHint">
+        <properties>
+            <property name="enableMixedTypeHint" value="false"/>
+        </properties>
+    </rule>
 </ruleset>