Ignore numba warning specific to ARM runners (#16872)

This PR ignores numba warnings that are showing up in arm runners: numba/numba#6589 (comment)

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - Bradley Dice (https://github.com/bdice)

URL: #16872

python/cudf/cudf/tests/pytest.ini

@@ -14,4 +14,6 @@ filterwarnings =
     ignore:Passing a BlockManager to DataFrame is deprecated:DeprecationWarning
     # 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
+    # Ignore numba PEP 456 warning specific to arm machines
+    ignore:FNV hashing is not implemented in Numba.*:UserWarning
 addopts = --tb=native