fix: exclude rector.php from psalm analysis to prevent crashes

The rector.php file imports external vendor configurations which causes
psalm to crash with exit code 255, especially on PHP 8.4. This was
causing CI/CD pipeline failures. By removing rector.php from psalm's
projectFiles configuration, psalm can complete successfully.

Author: lotyp

psalm.xml

@@ -21,6 +21,5 @@
         <directory name="src/"/>
         <directory name="tests/"/>
         <file name=".php-cs-fixer.dist.php"/>
-        <file name="rector.php"/>
     </projectFiles>
 </psalm>