chore: update psalm config

Author: kenjis

psalm.xml

@@ -1,12 +1,15 @@
 <?xml version="1.0"?>
 <psalm
+    phpVersion="8.1"
     errorLevel="7"
     resolveFromConfigFile="true"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
     autoloader="psalm_autoload.php"
     cacheDirectory="build/psalm/"
+    findUnusedBaselineEntry="false"
+    findUnusedCode="false"
 >
     <projectFiles>
         <directory name="src/" />

psalm_autoload.php

@@ -11,6 +11,10 @@
 
 foreach ($helperDirs as $dir) {
     $dir = __DIR__ . '/' . $dir;
+    if (! is_dir($dir)) {
+        continue;
+    }
+
     chdir($dir);
 
     foreach (glob('*_helper.php') as $filename) {
@@ -19,3 +23,5 @@
         require_once $filePath;
     }
 }
+
+chdir(__DIR__);