- reference github tarball
- cleanup dependencies

- update to version 4.9.1:
* Ensure tzdata dependency is installed on Windows
- additional changes from 4.9.0:
* Upgrade code to new minimum supported Python version: 3.8
* Settings support for pathlib.Path (#2758)
* Various improvements to Simple theme (#2976 & #3234)
* Use Furo as Sphinx documentation theme (#3023)
* Default to 100 articles maximum in feeds (#3127)
* Add period_archives common context variable (#3148)
* Use watchfiles as the file-watching backend (#3151)
* Add GitHub Actions workflow for GitHub Pages (#3189)
* Allow dataclasses in settings (#3204)
* Switch build tool to PDM instead of Setuptools/Poetry (#3220)
* Provide a plugin_enabled Jinja test for themes (#3235)
* Preserve connection order in Blinker (#3238)
* Remove social icons from default notmyidea theme (#3240)
* Remove unreliable WRITE_SELECTED feature (#3243)
* Importer: Report broken embedded video links when importing
from Tumblr (#3177)
* Importer: Remove newline addition when iterating Photo post
types (#3178)
* Importer: Force timestamp conversion in Tumblr importer to be
UTC with offset (#3221)
* Importer: Use tempfile for intermediate HTML file for Pandoc
(#3221)
* Switch linters to Ruff (#3223)
- drop python-311.patch: fixed upstream