Bump minimum SymPy version and add Python 3.9 to CI

Same as pystencils!208 (merged)

.gitlab-ci.yml

@@ -34,16 +34,14 @@ tests-and-coverage:
       cobertura: coverage.xml
       junit: report.xml
 
-# test run for the minimal sympy (1.2) version stated in setup.py
-minimal-sympy-version:
+# pipeline with latest python version
+latest-python:
   stage: test
   except:
     variables:
       - $ENABLE_NIGHTLY_BUILDS
-  image: i10git.cs.fau.de:5005/pycodegen/pycodegen/full
+  image: i10git.cs.fau.de:5005/pycodegen/pycodegen/latest_python
   script:
-    - pip install `grep -Eo 'sympy[>=]+[0-9\.]+' setup.py | sed 's/>/=/g'`
-    - pip install `grep -Eo 'numpy[>=]+[0-9\.]+' setup.py | sed 's/>/=/g'`
     - export NUM_CORES=$(nproc --all)
     - mkdir -p ~/.config/matplotlib
     - echo "backend:template" > ~/.config/matplotlib/matplotlibrc