Remove static from return type when final

Fixes #5244

src/Psalm/Internal/Type/TypeExpander.php

@@ -606,6 +606,7 @@ class TypeExpander
             }
         } elseif ($return_type->was_static && is_string($static_class_type) && $final) {
             $return_type->value = $static_class_type;
+            $return_type->was_static = false;
         } elseif ($self_class && $return_type_lc === 'self') {
             $return_type->value = $self_class;
         } elseif ($parent_class && $return_type_lc === 'parent') {

tests/MethodSignatureTest.php

@@ -903,6 +903,16 @@ class MethodSignatureTest extends TestCase
                 [],
                 '8.0'
             ],
+            'notExtendedStaticReturntypeInFinal' => [
+                '<?php
+                    final class X
+                    {
+                        public static function create(): static
+                        {
+                            return new self();
+                        }
+                    }'
+            ],
         ];
     }