https://bugs.gentoo.org/860087

Patch backported from upstream:

commit 1be6e8b387bbebcc891b0afc53802cf69607cfcf
Author: Chris Warrick <kwpolska@gmail.com>
Date:   Sun Jul 17 00:08:24 2022 +0200

    Fix #3635 — fix compatibility of Markdown extensions with Markdown 3.4+

--- Nikola-8.2.2/nikola/plugins/compile/markdown/mdx_gist.py
+++ Nikola-8.2.2/nikola/plugins/compile/markdown/mdx_gist.py
@@ -76,6 +76,7 @@
 """
 
 import requests
+import xml.etree.ElementTree as etree
 
 from nikola.plugin_categories import MarkdownExtension
 from nikola.utils import get_logger
@@ -84,11 +85,10 @@
     from markdown.extensions import Extension
     from markdown.inlinepatterns import Pattern
     from markdown.util import AtomicString
-    from markdown.util import etree
 except ImportError:
     # No need to catch this, if you try to use this without Markdown,
     # the markdown compiler will fail first
-    Extension = Pattern = object
+    Extension = Pattern = AtomicString = object
 
 
 LOGGER = get_logger('compile_markdown.mdx_gist')
--- Nikola-8.2.2/nikola/plugins/compile/markdown/mdx_podcast.py
+++ Nikola-8.2.2/nikola/plugins/compile/markdown/mdx_podcast.py
@@ -36,11 +36,12 @@
 <p><audio controls=""><source src="https://archive.org/download/Rebeldes_Stereotipos/rs20120609_1.mp3" type="audio/mpeg"></source></audio></p>
 """
 
+import xml.etree.ElementTree as etree
+
 from nikola.plugin_categories import MarkdownExtension
 try:
     from markdown.extensions import Extension
     from markdown.inlinepatterns import Pattern
-    from markdown.util import etree
 except ImportError:
     # No need to catch this, if you try to use this without Markdown,
     # the markdown compiler will fail first