Assert that at least one file in npz zipfile ends with .npy

from https://pydoc.dev/numpy/latest/numpy.lib.npyio.NpzFile.html:

> NpzFile is used to load files in the NumPy .npz data archive format. It assumes that files in the archive have a .npy extension, other files are ignored.

lib/galaxy/datatypes/binary.py

@@ -4135,9 +4135,9 @@ def __init__(self, **kwd):
 
     def sniff(self, filename: str) -> bool:
         try:
-            npz = np.load(filename)
-            if isinstance(npz, np.lib.npyio.NpzFile):
-                return True
+            with np.load(filename) as npz:
+                if isinstance(npz, np.lib.npyio.NpzFile) and any(f.filename.endswith(".npy") for f in npz.zip.filelist):
+                    return True
         except Exception:
             return False
         return False