fix: remove <REGION> from endpoint

Author: ChiragAgg5k

src/Spec/Swagger2.php

@@ -43,9 +43,15 @@ public function getVersion()
      */
     public function getEndpoint()
     {
-        return $this->getAttribute('schemes.0', 'https') .
-        '://' . $this->getAttribute('host', 'example.com') .
-        $this->getAttribute('basePath', '');
+        $scheme = $this->getAttribute('schemes.0', 'https');
+        $host = $this->getAttribute('host', 'example.com');
+        $basePath = $this->getAttribute('basePath', '');
+
+        if (str_starts_with($host, '<REGION>.')) {
+            $host = substr($host, 9);
+        }
+
+        return $scheme . '://' . $host . $basePath;
     }
 
     /**