fix: version-specific fixture for Symfony 7.3 and remove stale baseline entry

- Use 'symfony-7.3' fixture suffix for Symfony 7.3 where the unsealed
  array shape extra value type is resolved differently (oneOf vs nullable)
- Remove stale LegacyTypeConverter baseline entry that was erroneously
  added and doesn't exist on 5.x

Author: lacatoire

phpstan-baseline.neon

@@ -42,12 +42,6 @@ parameters:
 			count: 2
 			path: src/Render/Html/HtmlOpenApiRenderer.php
 
-		-
-			message: '#^Unable to resolve the template type T in call to static method Symfony\\Component\\TypeInfo\\Type\:\:collection\(\)$#'
-			identifier: argument.templateType
-			count: 1
-			path: src/Util/LegacyTypeConverter.php
-
 		-
 			message: '#^PHPDoc tag @implements has invalid type Symfony\\Component\\TypeInfo\\Type\\ArrayShapeType\.$#'
 			count: 1

tests/Functional/ControllerTest.php

@@ -720,7 +720,7 @@ static function (RoutingConfigurator $routes) {
         if (version_compare(Kernel::VERSION, '7.3.0', '>=') && class_exists(TypeInfoType\ArrayShapeType::class)) {
             yield 'Array shape types' => [
                 'ArrayShapeController',
-                null,
+                version_compare(Kernel::VERSION, '7.4.0', '>=') ? null : 'symfony-7.3',
                 [],
                 [
                     'nelmio_api_doc' => [