filters: use importlib_resources API to avoid deprecation warning

Fix deprecation warning "pkg_resources is deprecated as an API"

resampy/filters.py

@@ -47,7 +47,7 @@
 
 import numpy as np
 import os
-import pkg_resources
+import importlib_resources
 import sys
 
 FILTER_FUNCTIONS = ['sinc_window']
@@ -206,7 +206,7 @@ def load_filter(filter_name):
         fname = os.path.join('data',
                              os.path.extsep.join([filter_name, 'npz']))
 
-        data = np.load(pkg_resources.resource_filename(__name__, fname))
+        data = np.load(importlib_resources.files(__name__).joinpath(fname))
         FILTER_CACHE[filter_name] = data['half_window'], data['precision'], data['rolloff']
 
     return FILTER_CACHE[filter_name]