[enh] remove runner tags in .gitlab-ci.yml

.gitlab-ci.yml

@@ -30,8 +30,6 @@ image: registry.duniter.org/docker/python3/duniterpy-builder:0.0.7
     - bash -c "git push --force --mirror github 2>&1 | grep -v duniter-gitlab; echo $?"
 
 .env:
-  tags:
-    - redshift-docker-python
   before_script:
     - export PYENV_ROOT="$HOME/.pyenv"
     - export PATH="$PYENV_ROOT/bin:$PATH"