chore: drop Python 3.11 support

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

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

Author: feanil

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.11", "3.12"]
+        python-version: ["3.12"]
         toxenv: [quality, docs, pii_check, django42, django52]
     steps:
       - uses: actions/checkout@v6

setup.py

@@ -143,7 +143,7 @@ def is_requirement(line):
     ),
     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",
@@ -156,7 +156,6 @@ 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",
     ],
     entry_points={

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{311,312}-django{42,52}
+envlist = py312-django{42,52}
 
 [doc8]
 ; D001 = Line too long