upgrade to laravel 7 and set branch to v2

vendor/symfony/routing/Loader/AnnotationFileLoader.php

@@ -50,7 +50,7 @@ class AnnotationFileLoader extends FileLoader
      *
      * @throws \InvalidArgumentException When the file does not exist or its routes cannot be parsed
      */
-    public function load($file, $type = null)
+    public function load($file, string $type = null)
     {
         $path = $this->locator->locate($file);
 
@@ -73,7 +73,7 @@ class AnnotationFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, $type = null)
+    public function supports($resource, string $type = null)
     {
         return \is_string($resource) && 'php' === pathinfo($resource, \PATHINFO_EXTENSION) && (!$type || 'annotation' === $type);
     }
@@ -81,11 +81,9 @@ class AnnotationFileLoader extends FileLoader
     /**
      * Returns the full class name for the first class in the file.
      *
-     * @param string $file A PHP file path
-     *
      * @return string|false Full class name if found, false otherwise
      */
-    protected function findClass($file)
+    protected function findClass(string $file)
     {
         $class = false;
         $namespace = false;