rel(23.0.0): fix deploy job [skip ci]

Author: oesteban

.circleci/config.yml

@@ -226,7 +226,7 @@ jobs:
 
   deploy_pypi:
     docker:
-      - image: circleci/python:3.7.4
+      - image: cimg/python:3.9
         auth:
           username: $DOCKER_USER
           password: $DOCKER_PAT
@@ -239,7 +239,7 @@ jobs:
           command: |
             python3 -m venv /tmp/upload
             source /tmp/upload/bin/activate
-            python3 -m pip install twine
+            python3 -m pip install -U twine pip
             python3 -m twine check dist/*
             python3 -m twine upload dist/*