Update standard dev and test python version to 3.8 (#1668)

* Adapt to python 3.8 in local dev and test
* Update to python 3.8 as standard in CI

.github/workflows/ci.yaml

@@ -115,10 +115,10 @@ jobs:
     needs: [lint, gitattributes]
     steps:
     - uses: actions/checkout@master
-    - name: Set up Python 3.7
+    - name: Set up Python 3.8
       uses: actions/setup-python@v4
       with:
-        python-version: 3.7
+        python-version: 3.8
     - name: Install pypa/build
       run: >-
         python -m

.github/workflows/daily_check.yaml

@@ -56,10 +56,10 @@ jobs:
         env:
           PYTHON_TEST_VERSION: ${{ matrix.python-version }}
         run: make tests
-      - name: Set up Python 3.7
+      - name: Set up Python 3.8
         uses: actions/setup-python@v4
         with:
-          python-version: 3.7
+          python-version: 3.8
       - name: Install pypa/build
         run: >-
           python -m

Dockerfile

@@ -1,14 +1,12 @@
-FROM python:3.7-buster
+FROM python:3.8-buster
 
 ENV DEBIAN_FRONTEND=noninteractive
-ENV VIRTUALENV_PYTHON=/usr/bin/python3.7
+ENV VIRTUALENV_PYTHON=/usr/bin/python3.8
 
-ARG DEV_PACKAGES="python3-dev build-essential"
+ARG DEV_PACKAGES="build-essential"
 
 RUN apt-get update && \
   apt-get install --yes --no-install-recommends \
-  python3-venv \
-  virtualenv \
   ${DEV_PACKAGES} \
   zsh \
   vim \