upgrade to python 3.10 (#19568)

* run CI with python3.10

* change Dockerfile.deploy too

.circleci/config.yml

@@ -283,7 +283,7 @@ references:
 
   docker-images:
     # These versions should try to match what we run in production.
-    - &python "cimg/python:3.9"
+    - &python "cimg/python:3.10"
     - &redis "redis:6.2"
     - &memcached "memcached:1.4"
     - &mysql "mysql:8.0.28"

.readthedocs.yml

@@ -8,7 +8,7 @@ version: 2
 build:
   os: ubuntu-20.04
   tools:
-    python: "3.9"
+    python: "3.10"
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim-buster
+FROM python:3.10-slim-buster
 
 ENV PYTHONDONTWRITEBYTECODE=1
 

Dockerfile.deploy

@@ -1,4 +1,4 @@
-FROM python:3.9-slim-buster
+FROM python:3.10-slim-buster
 
 # need to compile swig
 ENV SWIG_FEATURES="-D__x86_64__"

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 88
-target-version = ['py39']
+target-version = ['py310']
 skip-string-normalization = true
 exclude = '''
 (

setup.py

@@ -25,7 +25,7 @@ setup(
         'Framework :: Django',
         'Topic :: Internet :: WWW/HTTP :: Browsers',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
     ],
     entry_points={
         'babel.extractors': [