Add workaround to make tests work on Python 3.12

Author: user202729

src/sage/doctest/util.py

@@ -880,7 +880,8 @@ def ensure_interruptible_after(seconds: float, max_wait_after_interrupt: float =
 
     try:
         yield data
-    except AlarmInterrupt:
+    except AlarmInterrupt as e:
+        e.__traceback__ = None  # workaround for https://github.com/python/cpython/pull/129276
         alarm_raised = True
     finally:
         before_cancel_alarm_elapsed = walltime() - start_time