Replace pkg_resources with importlib.resources for Python 3.14 compatibility

ebook_converter/ebooks/oeb/polish/toc.py

@@ -1,7 +1,7 @@
 import collections
 import functools
 import operator
-import pkg_resources
+from importlib.resources import files
 import re
 import urllib.parse
 
@@ -719,9 +719,8 @@ def commit_nav_toc(container, toc, lang=None, landmarks=None,
         if previous_nav is not None:
             root = previous_nav[1]
         else:
-            with open(pkg_resources.
-                      resource_filename('ebook_converter',
-                                        'data/new_nav.html')) as fobj:
+            with open(str(files('ebook_converter')
+                          .joinpath('data/new_nav.html'))) as fobj:
                 root = container.parse_xhtml(fobj.read())
         container.replace(tocname, root)
     else:
@@ -874,8 +873,7 @@ def toc_to_html(toc, container, toc_name, title, lang=None):
 
     E = ElementMaker(namespace=const.XHTML_NS, nsmap={None: const.XHTML_NS})
     # TODO(gryf): revisit lack of css.
-    css_f = pkg_resources.resource_filename('ebook_converter',
-                                            'data/inline_toc_styles.css')
+    css_f = str(files('ebook_converter').joinpath('data/inline_toc_styles.css'))
     html = E.html(E.head(E.title(title),
                          E.style(css_f, type='text/css')),
                   E.body(E.h2(title), E.ul(),