chore: drop Python 3.11 support

Remove Python 3.11 from CI matrix, tox envlist, publish workflow,
readthedocs config, setup.py classifiers, and python_requires.
Part of openedx/public-engineering#499

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: feanil

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]  # Add macos-latest later?
-        python-version: ['3.11', '3.12']
+        python-version: ['3.12']
         toxenv: ["django52", "package", "quality"]
         mysql-version: ["8"]
     services:

.github/workflows/pypi-publish.yml

@@ -15,7 +15,7 @@ jobs:
       - name: setup python
         uses: actions/setup-python@v6
         with:
-          python-version: 3.11
+          python-version: 3.12
 
       - name: Install pip
         run: pip install -r requirements/pip.txt

.readthedocs.yaml

@@ -10,6 +10,6 @@ sphinx:
   configuration: docs/conf.py
 
 python:
-  version: 3.11
+  version: 3.12
   install:
     - requirements: requirements/doc.txt

setup.py

@@ -75,7 +75,7 @@ def is_requirement(line):
     packages=find_packages("src"),
     include_package_data=True,
     install_requires=load_requirements('requirements/base.in'),
-    python_requires=">=3.11",
+    python_requires=">=3.12",
     license="AGPL 3.0",
     zip_safe=False,
     keywords='Python edx',
@@ -87,7 +87,6 @@ def is_requirement(line):
         'License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)',
         'Natural Language :: English',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
     ],
 )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{311,312}-django{52}, quality, docs, pii_check, lint-imports
+envlist = py312-django{52}, quality, docs, pii_check, lint-imports
 
 [doc8]
 ; D001 = Line too long