Bump importlib-resources from 6.4.0 to 6.4.5 (#2394)

* Bump importlib-resources from 6.4.0 to 6.4.5

Bumps [importlib-resources](https://github.com/python/importlib_resources) from 6.4.0 to 6.4.5.
- [Release notes](https://github.com/python/importlib_resources/releases)
- [Changelog](https://github.com/python/importlib_resources/blob/main/NEWS.rst)
- [Commits](https://github.com/python/importlib_resources/compare/v6.4.0...v6.4.5)

---
updated-dependencies:
- dependency-name: importlib-resources
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update importlib-resources==6.4.5

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

[skip ci]

lib/importlib_resources/readers.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import collections
 import contextlib
 import itertools
@@ -5,6 +7,7 @@ import pathlib
 import operator
 import re
 import warnings
+from collections.abc import Iterator
 
 from . import abc
 
@@ -34,8 +37,10 @@ class FileReader(abc.TraversableResources):
 
 class ZipReader(abc.TraversableResources):
     def __init__(self, loader, module):
-        _, _, name = module.rpartition('.')
-        self.prefix = loader.prefix.replace('\\', '/') + name + '/'
+        self.prefix = loader.prefix.replace('\\', '/')
+        if loader.is_package(module):
+            _, _, name = module.rpartition('.')
+            self.prefix += name + '/'
         self.archive = loader.archive
 
     def open_resource(self, resource):
@@ -133,27 +138,31 @@ class NamespaceReader(abc.TraversableResources):
     def __init__(self, namespace_path):
         if 'NamespacePath' not in str(namespace_path):
             raise ValueError('Invalid path')
-        self.path = MultiplexedPath(*map(self._resolve, namespace_path))
+        self.path = MultiplexedPath(*filter(bool, map(self._resolve, namespace_path)))
 
     @classmethod
-    def _resolve(cls, path_str) -> abc.Traversable:
+    def _resolve(cls, path_str) -> abc.Traversable | None:
         r"""
         Given an item from a namespace path, resolve it to a Traversable.
 
         path_str might be a directory on the filesystem or a path to a
         zipfile plus the path within the zipfile, e.g. ``/foo/bar`` or
         ``/foo/baz.zip/inner_dir`` or ``foo\baz.zip\inner_dir\sub``.
+
+        path_str might also be a sentinel used by editable packages to
+        trigger other behaviors (see python/importlib_resources#311).
+        In that case, return None.
         """
-        (dir,) = (cand for cand in cls._candidate_paths(path_str) if cand.is_dir())
-        return dir
+        dirs = (cand for cand in cls._candidate_paths(path_str) if cand.is_dir())
+        return next(dirs, None)
 
     @classmethod
-    def _candidate_paths(cls, path_str):
+    def _candidate_paths(cls, path_str: str) -> Iterator[abc.Traversable]:
         yield pathlib.Path(path_str)
         yield from cls._resolve_zip_path(path_str)
 
     @staticmethod
-    def _resolve_zip_path(path_str):
+    def _resolve_zip_path(path_str: str):
         for match in reversed(list(re.finditer(r'[\\/]', path_str))):
             with contextlib.suppress(
                 FileNotFoundError,