Replace deprecated code and add missing dependency

conversion_utils/jos_msds_and_properties.py

@@ -1,7 +1,7 @@
 import lxml.etree as lxml
 import re
 import pickle
-import importlib_resources as pkg_resources
+from importlib_resources import files
 
 from conversion_utils.utils import xpath_find, get_xml_id
 
@@ -241,9 +241,10 @@ class Converter:
 
     def __init__(self, xml_file_name=None):
         if (xml_file_name is None):
-            if (pkg_resources.is_resource('conversion_utils.resources', JOS_SPECIFICATIONS_PICKLE_RESOURCE)):
+            resource = files('conversion_utils.resources').joinpath(JOS_SPECIFICATIONS_PICKLE_RESOURCE)
+            if (resource.is_file()):
                 try:
-                    with pkg_resources.open_binary('conversion_utils.resources', JOS_SPECIFICATIONS_PICKLE_RESOURCE) as pickle_file:
+                    with resource.open('rb') as pickle_file:
                         self.specifications = pickle.load(pickle_file)
                 except:
                     exit('Could not parse specifications pickle file installed.')