Fix psalm warnings and update baseline

Author: markstory

psalm-baseline.xml

@@ -1,10 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="3.18.2@19aa905f7c3c7350569999a93c40ae91ae4e1626">
-  <file src="src/Controller/DashboardController.php">
-    <NullableReturnStatement occurrences="1">
-      <code>$this-&gt;redirect(['action' =&gt; 'index'])</code>
-    </NullableReturnStatement>
-  </file>
+<files psalm-version="4.x-dev@">
   <file src="src/Controller/MailPreviewController.php">
     <PossiblyInvalidArgument occurrences="1">
       <code>$partType</code>
@@ -101,12 +96,12 @@
     </MoreSpecificReturnType>
   </file>
   <file src="src/Panel/SqlLogPanel.php">
-    <UndefinedInterfaceMethod occurrences="1">
-      <code>genericInstances</code>
-    </UndefinedInterfaceMethod>
     <TypeDoesNotContainType occurrences="1">
       <code>!$connection instanceof ConnectionInterface</code>
     </TypeDoesNotContainType>
+    <UndefinedInterfaceMethod occurrences="1">
+      <code>genericInstances</code>
+    </UndefinedInterfaceMethod>
   </file>
   <file src="src/Plugin.php">
     <InvalidArgument occurrences="1"/>
@@ -120,15 +115,16 @@
     <DeprecatedMethod occurrences="1">
       <code>makeNeatArray</code>
     </DeprecatedMethod>
-    <InvalidArgument occurrences="2">
-      <code>$value</code>
-      <code>$values</code>
-    </InvalidArgument>
     <InternalClass occurrences="1">
       <code>new HtmlFormatter()</code>
     </InternalClass>
     <InternalMethod occurrences="1">
       <code>dump</code>
     </InternalMethod>
+    <InvalidArgument occurrences="3">
+      <code>$currentAncestors</code>
+      <code>$value</code>
+      <code>$values</code>
+    </InvalidArgument>
   </file>
 </files>

psalm.xml

@@ -7,7 +7,7 @@
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
     autoloader="tests/bootstrap.php"
     usePhpDocMethodsWithoutMagicCall="true"
-    errorBaseline="psalm-baseline.xml"
+    errorBaseline="./psalm-baseline.xml"
 >
     <projectFiles>
         <directory name="src" />

src/Cache/Engine/DebugEngine.php

@@ -28,7 +28,7 @@ class DebugEngine extends CacheEngine
     /**
      * Proxied cache engine config.
      *
-     * @var mixed
+     * @var array
      */
     protected $_config;
 

src/Model/Entity/Panel.php

@@ -29,7 +29,7 @@ class Panel extends Entity
     /**
      * Some fields should not be in JSON/array exports.
      *
-     * @var array
+     * @var string[]
      */
     protected $_hidden = ['content'];