Replace pkg_resources with importlib.resources (#65)

* Initial plan

* Replace pkg_resources with importlib.resources

Co-authored-by: inducer <352067+inducer@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: inducer <352067+inducer@users.noreply.github.com>

Author: Copilot

codepy/libraries.py

@@ -185,8 +185,8 @@ def get_numpy_incpath() -> str:
 
 def add_py_module(toolchain: Toolchain, name: str) -> None:
     def get_module_include_path(name: str) -> str:
-        from pkg_resources import Requirement, resource_filename
-        return resource_filename(Requirement.parse(name), f"{name}/include")
+        from importlib.resources import files
+        return str(files(name) / "include")
 
     toolchain.add_library(name, [get_module_include_path(name)], [], [])