Try fix CI on PHP 7.4

Author: janedbal

build/more-enum-adapter-errors.neon

@@ -23,3 +23,6 @@ parameters:
 			message: "#^Class BackedEnum not found\\.$#"
 			count: 1
 			path: ../src/Type/Php/BackedEnumFromMethodDynamicReturnTypeExtension.php
+
+		-
+			message: "#^Call to method PHPStan\\\\Reflection\\\\ClassReflection::isEnum\\(\\) will always evaluate to false\\.$#"

tests/PHPStan/Reflection/ClassReflectionTest.php

@@ -296,7 +296,7 @@ public function testEnumIsFinal(): void
 		$reflectionProvider = $this->createReflectionProvider();
 		$enum = $reflectionProvider->getClass('PHPStan\Fixture\TestEnum');
 		$this->assertTrue($enum->isEnum());
-		$this->assertInstanceOf('ReflectionEnum', $enum->getNativeReflection()); // @phpstan-ignore method.alreadyNarrowedType
+		$this->assertInstanceOf('ReflectionEnum', $enum->getNativeReflection()); // @phpstan-ignore-line
 		$this->assertTrue($enum->isFinal());
 		$this->assertTrue($enum->isFinalByKeyword());
 	}