fix some psalm errors

psalm.xml

@@ -6,6 +6,7 @@
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config tests/app/vendor/vimeo/psalm/config.xsd"
     errorBaseline="psalm-baseline.xml"
+    cacheDirectory="./.psalm"
 >
     <projectFiles>
         <directory name="src" />
@@ -13,4 +14,15 @@
             <directory name="./tests/" />
         </ignoreFiles>
     </projectFiles>
+
+    <!-- suppress error around parameter bags - see https://github.com/symfony/symfony/issues/45609#issuecomment-1056816975 -->
+    <!-- maybe to desactivate with php 8.1 ? -->
+    <issueHandlers>
+        <UndefinedDocblockClass>
+            <errorLevel type="suppress">
+                <referencedClass name="UnitEnum" />
+            </errorLevel>
+        </UndefinedDocblockClass>
+    </issueHandlers>
+
 </psalm>