Ignore new cupy warning (#15574)

cupy 13.1 added a warning about the jitify cache warming up that we must silence in our test suite for it to pass.

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - https://github.com/brandon-b-miller
  - GALI PREM SAGAR (https://github.com/galipremsagar)
  - Bradley Dice (https://github.com/bdice)

URL: #15574

python/cudf/cudf/tests/pytest.ini

@@ -8,5 +8,7 @@ filterwarnings =
     error
     ignore:::.*xdist.*
     ignore:::.*pytest.*
+    # Deprecation warning from Pyarrow Table.to_pandas() with pandas-2.2+
     ignore:Passing a BlockManager to DataFrame is deprecated:DeprecationWarning
-    # Above deprecation warning comes from Pyarrow Table.to_pandas() with pandas-2.2+
+    # PerformanceWarning from cupy warming up the JIT cache
+    ignore:Jitify is performing a one-time only warm-up to populate the persistent cache:cupy._util.PerformanceWarning