fix builtins module (#276)

src/viser/_gui_api.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import builtins
 import colorsys
 import dataclasses
 import functools
@@ -1242,7 +1243,7 @@ def add_slider(
         """
         value: IntOrFloat = initial_value
         assert max >= min
-        step = __builtins__.min(step, max - min)
+        step = builtins.min(step, max - min)
         assert max >= value >= min
 
         # GUI callbacks cast incoming values to match the type of the initial value. If
@@ -1325,7 +1326,7 @@ def add_multi_slider(
             A handle that can be used to interact with the GUI element.
         """
         assert max >= min
-        step = __builtins__.min(step, max - min)
+        step = builtins.min(step, max - min)
         assert all(max >= x >= min for x in initial_value)
 
         # GUI callbacks cast incoming values to match the type of the initial value. If