Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -11,7 +11,7 @@ west_build:
  before_script:
    - apt-get update > /dev/null
    - apt-get install -qq git > /dev/null 
-   - apt-get install -qq wget python-dev build-essential python-setuptools
+   - apt-get install -qq wget python3-sphinx
  script:
    - git clone -b $CI_COMMIT_REF_NAME $CI_REPOSITORY_URL westpy
    - cd westpy