Update to Python 3.9

See #102

.gitlab-ci.yml

-image: python:3.8
+image: python:3.9
 
 stages:
   - test
 
 before_script:
   - apt-get -qq update
-  - python3.8 -m venv python
+  - python3.9 -m venv python
   - . python/bin/activate
   - pip3 install -r requirements.txt
   - cp config/sample-production.engine.ini config/engine.ini

docs/bare-metal-installation.md

@@ -21,7 +21,7 @@
 
 Aura Engine runs on any modern Debian-based OS. It requires at least
 
-- [Python 3.8+](https://www.python.org/downloads/release/python-380/)
+- [Python 3.9+](https://www.python.org/downloads/release/python-380/)
 - [`pip`](https://pip.pypa.io/en/stable/)
 - [`git`](https://git-scm.com/)
 - [PostgreSQL 13+](https://www.postgresql.org/)

run.py

 #!/bin/sh
 ''''which python3.9 >/dev/null 2>&1 && exec python3.9 "$0" "$@"     # '''
-''''which python3.8  >/dev/null 2>&1 && exec python3.8  "$0" "$@"   # '''
 ''''exec echo "Error: Snaaakey Python, where are you?"                # '''
 
 #

run.sh

@@ -32,7 +32,7 @@ echo "[ Run mode=$mode ]"
 echo "[ Docker=$docker ]"
 
 
-# Check for the correct Python version (3.8+)
+# Check for the correct Python version
 PYTHON_EXEC="python3"
 echo "[ Using $(python3 -V) ]"