Backport PR #55397 on branch 2.1.x (MAINT: Add warning filter for `np…

….long`) (#55402)

Backport PR #55397: MAINT: Add warning filter for `np.long`

Co-authored-by: Mateusz Sokół <8431159+mtsokol@users.noreply.github.com>

pandas/compat/numpy/__init__.py

@@ -1,4 +1,6 @@
 """ support numpy compatibility across versions """
+import warnings
+
 import numpy as np
 
 from pandas.util.version import Version
@@ -26,8 +28,14 @@
 
 if _nlv >= Version("2.0.0.dev0"):
     try:
-        np_long = np.long  # type: ignore[attr-defined]
-        np_ulong = np.ulong  # type: ignore[attr-defined]
+        with warnings.catch_warnings():
+            warnings.filterwarnings(
+                "ignore",
+                r".*In the future `np\.long` will be defined as.*",
+                FutureWarning,
+            )
+            np_long = np.long  # type: ignore[attr-defined]
+            np_ulong = np.ulong  # type: ignore[attr-defined]
     except AttributeError:
         np_long = np.int_
         np_ulong = np.uint