Migration to new CircleCI docker images

see https://circleci.com/developer/images/image/cimg/python for more.

Author: reactive-firewall

.circleci/config.yml

@@ -2,10 +2,12 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/python:3.7
-      - image: circleci/python:3.8
-      - image: circleci/python:3.9
-      - image: circleci/python:3.10
+      - image: cimg/python:3.7
+      - image: cimg/python:3.8
+      - image: cimg/python:3.9
+      - image: cimg/python:3.10
+      - image: cimg/python:3.11
+      - image: cimg/python:3.12
     environment:
       CI: cicleci
       DEBIAN_FRONTEND: noninteractive
@@ -42,10 +44,12 @@ jobs:
 
   test:
     docker:
-      - image: circleci/python:3.7
-      - image: circleci/python:3.8
-      - image: circleci/python:3.9
-      - image: circleci/python:3.10
+      - image: cimg/python:3.7
+      - image: cimg/python:3.8
+      - image: cimg/python:3.9
+      - image: cimg/python:3.10
+      - image: cimg/python:3.11
+      - image: cimg/python:3.12
     parallelism: 2
     environment:
       CI: cicleci
@@ -90,10 +94,12 @@ jobs:
 
   pytest:
     docker:
-      - image: circleci/python:3.7
-      - image: circleci/python:3.8
-      - image: circleci/python:3.9
-      - image: circleci/python:3.10
+      - image: cimg/python:3.7
+      - image: cimg/python:3.8
+      - image: cimg/python:3.9
+      - image: cimg/python:3.10
+      - image: cimg/python:3.11
+      - image: cimg/python:3.12
     parallelism: 2
     environment:
       CI: cicleci
@@ -150,7 +156,7 @@ jobs:
 
   lint:
     docker:
-      - image: circleci/python:3.8
+      - image: cimg/python:3.11
     environment:
       CI: cicleci
       DEBIAN_FRONTEND: noninteractive