Pelican 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)
• 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)