fix slash redirection on root

Author: dpgiakatos

controllers/root_controller.py

@@ -14,6 +14,6 @@
 
 class RootController:
     @staticmethod
-    @router.get("/", include_in_schema=False)
+    @router.get("/", include_in_schema=False, redirect_slashes=True)
     def get_all_countries():
         return RedirectResponse(url="/docs" if PROXY_PATH is None else f"/{PROXY_PATH}/docs")