Prepare for release 3.11.0 (#1569)

Also added EOL date to the changelog entry for dropping Python 3.9.

Author: ddabble

CHANGES.rst

@@ -4,9 +4,13 @@ Changes
 Unreleased
 ----------
 
+
+3.11.0 (2025-12-09)
+-------------------
+
 - Added support for Python 3.14 (gh-1529)
 - Added support for Django 6.0 (gh-1529)
-- Dropped support for Python 3.9 (gh-1560)
+- Dropped support for Python 3.9, which reached end-of-life on 2025-10-31 (gh-1560)
 - Added Ukrainian localization (gh-1547)
 
 3.10.1 (2025-06-20)