Fix incorrect logging call in JPSRO algorithm

`logging.debug` doesn't take a `flush=` argument.

PiperOrigin-RevId: 883189849
Change-Id: If55fbde1fccb387639714e92001f23329a37267f

Author: ilai-deutel

open_spiel/python/algorithms/jpsro.py

@@ -227,11 +227,11 @@ def wrapper(payoff, per_player_repeats, *args, eliminate_dominated=True,
 # Optimization.
 def _try_two_solvers(func, *args, **kwargs):
   try:
-    logging.debug("Trying CVXOPT.", flush=True)
+    logging.debug("Trying CVXOPT.")
     kwargs_ = {"solver_kwargs": DEFAULT_CVXOPT_SOLVER_KWARGS, **kwargs}
     res = func(*args, **kwargs_)
   except:  # pylint: disable=bare-except
-    logging.debug("CVXOPT failed. Trying OSQP.", flush=True)
+    logging.debug("CVXOPT failed. Trying OSQP.")
     kwargs_ = {"solver_kwargs": DEFAULT_OSQP_SOLVER_KWARGS, **kwargs}
     res = func(*args, **kwargs_)
   return res