DEBUG: disable numba cache in test_progressbar_nested_compound

Investigating systematic Bad initial energy failures of this test on
the ubuntu (numba, 3.14, ...) CI job. Theory per pytensor#2051: the
custom numba cache is not safe across multiprocessing, and a cache
collision produces inconsistent compiled logps between the parent
process and chain children.

Author: ricardoV94

tests/progress_bar/test_manager.py

@@ -14,6 +14,7 @@
 
 from unittest.mock import patch
 
+import pytensor
 import pytest
 
 import pymc as pm
@@ -153,7 +154,8 @@ def test_smc_multi_chain(imh_kernel):
 
 def test_progressbar_nested_compound():
     """Regression test for https://github.com/pymc-devs/pymc/issues/7721"""
-    with pm.Model():
+    # DEBUG: disable numba cache to test cache-race hypothesis for CI flake
+    with pytensor.config.change_flags(numba__cache=False), pm.Model():
         a = pm.Poisson("a", mu=10)
         b = pm.Binomial("b", n=a, p=0.8)
         c = pm.Poisson("c", mu=11)