Update markdown requirement from <3.5,>=3.4 to >=3.4,<3.6 (#1323)

Updates the requirements on [markdown](https://github.com/Python-Markdown/markdown) to permit the latest version.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Changelog](https://github.com/Python-Markdown/markdown/blob/master/docs/changelog.md)
- [Commits](Python-Markdown/markdown@3.4...3.5.1)

---
updated-dependencies:
- dependency-name: markdown
  dependency-type: direct:production
...

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pyproject.toml

@@ -58,7 +58,7 @@ dependencies = [
     # django-wiki's integration with Markdown is really detailed,
     # several extensions have imported internal APIs, so be very
     # careful here.
-    "Markdown>=3.4,<3.5",
+    "Markdown>=3.4,<3.6",
     "pymdown-extensions",
 ]
 dynamic = ["version"]