chore: add new parameters

To suppress the following warnings:
Warning: "findUnusedBaselineEntry" will be defaulted to "true" in Psalm 6. You should explicitly enable or disable this setting.
Warning: "findUnusedCode" will be defaulted to "true" in Psalm 6. You should explicitly enable or disable this setting.

findUnusedBaselineEntry="false"
Because enabled PHP extensions vary depending on the developer's environment,
setting this to true will likely result in errors.

psalm.xml

@@ -8,6 +8,8 @@
     autoloader="psalm_autoload.php"
     cacheDirectory="build/psalm/"
     errorBaseline="psalm-baseline.xml"
+    findUnusedBaselineEntry="false"
+    findUnusedCode="false"
 >
     <projectFiles>
         <directory name="app/" />