[cocopp] Use importlib to for paths relative to cocopp

Partial fix for #2229

code-postprocessing/cocopp/toolsdivers.py

@@ -599,8 +599,8 @@ def get_version_label(algorithmID=None):
 
 
 def path_in_package(sub_path=""):
-    import pkg_resources
+    from importlib import resources as res
     """return the absolute path prepended to `subpath` in this module.
     """
-    egg_info = pkg_resources.require('cocopp')[0]
-    return os.path.join(egg_info.location, egg_info.project_name, sub_path)
+    import .. as cocopp
+    return str(res.files(cocopp) / subpath)