[Fix] Update for Docker Images

Due to an update of the docker images minor changes are required for the CI

.gitlab-ci.yml

@@ -61,7 +61,7 @@ tests-and-coverage-with-longrun:
 
 # pipeline with latest python version
 latest-python:
-  stage: test
+  stage: pretest
   except:
     variables:
       - $ENABLE_NIGHTLY_BUILDS
@@ -109,8 +109,7 @@ ubuntu:
   before_script:
     # - apt-get -y remove python3-sympy
     - ln -s /usr/include/locale.h /usr/include/xlocale.h
-    - pip3 install sympy==1.6
-    # - pip3 install `grep -Eo 'sympy[>=]+[0-9\.]+' setup.py | sed 's/>/=/g'`
+    - pip3 install `grep -Eo 'sympy[>=]+[0-9\.]+' setup.py | sed 's/>/=/g'`
     # - pip3 install `grep -Eo 'sympy[>=]+[0-9\.]+' setup.py | sed 's/>/=/g'`
   script:
     - export NUM_CORES=$(nproc --all)
@@ -284,7 +283,7 @@ flake8-lint:
 
 
 build-documentation:
-  stage: test
+  stage: pretest
   image: i10git.cs.fau.de:5005/pycodegen/pycodegen/documentation
   script:
     - export PYTHONPATH=`pwd`