Edit gitlab-ci.yml to fetch silx from pypi

.gitlab-ci.yml

@@ -24,10 +24,7 @@ variables:
     - echo "Running $(python --version) from $(which python) on $(hostname) ($(arch))"
     - pip install --upgrade pip setuptools wheel
     - pip install --upgrade numpy
-#    - pip install --upgrade silx
-# Use the development version waiting for 0.14
-    - pip install silx --pre --find-links https://silx.gitlab-pages.esrf.fr/bob/silx/
-#
+    - pip install silx --upgrade --pre silx
     - pip install scipy
     - if [[ $CI_RUNNER_TAGS == *"gpu"* ]]; then pip install pycuda scikit-cuda; fi