Exclude problematic rule

Author: arokettu

SandFox_PHP82/ruleset.xml

@@ -3,6 +3,9 @@
     @see https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-Ruleset
 -->
 <ruleset>
-    <rule ref="SandFox_PHP81"/>
+    <rule ref="SandFox_PHP81">
+        <!-- interferes with readonly classes -->
+        <exclude name="PSR1.Files.SideEffects.FoundWithSymbols"/>
+    </rule>
     <config name="testVersion" value="8.2-"/>
 </ruleset>