chore : python3 -> python

.gitlab/ci/ubuntu_python.gitlab-ci.yml

@@ -50,7 +50,7 @@ test:ubuntu_python:
     - !reference [.retrieve_deps:apt, script]
   script:
     - source venv/bin/activate
-    - python3 -m pip install unittest-xml-reporting
+    - python -m pip install unittest-xml-reporting
     - >
       if [[ "$CI_PROJECT_NAME" == "aidge_onnx" ]]; then
         python3 -m pip install requests
@@ -59,7 +59,7 @@ test:ubuntu_python:
     # Run on discovery all tests located in project/unit_tests/python and discard the stdout 
     # only to show the errors/warnings and the results of the tests
     - python -m pip list
-    - python3 -m xmlrunner discover -s unit_tests/ -v -b --output-file xmlrunner-results.xml
+    - python -m xmlrunner discover -s unit_tests/ -v -b --output-file xmlrunner-results.xml
 
   artifacts:
     reports:
@@ -79,7 +79,7 @@ coverage:ubuntu_python:
     - apt-get update
     - apt-get install -y python-is-python3 python3-pip cmake # cmake for aidge_core tests
     - source venv/bin/activate
-    - python -m pip install numpy coverage requests
+    - python -m pip install numpy coverage requests unittest-xml-reporting
   script:
     - cd ${CI_PROJECT_NAME}
     # Retrieve the installation path of the module, since it is installed with pip.