MNT: fix error when using numpy 2+

If you specify python 3.10+ in the conda install,
numpy will then be installed with the latest version 2.20.

Updated numpy has removed np.compat.long, which was for compatibility with
python 2's 'long' variable, and we don't support python 2.
('long' is replaced with the just an expanded 'int' in python 3).

pydm/data_plugins/epics_plugins/pva_codec.py

@@ -12,7 +12,7 @@
     np.int8,
     np.int16,
     np.int32,
-    np.compat.long,
+    np.int64,  # same as np.long
     np.uint8,
     np.uint16,
     np.uint32,