Change the virtual env used during documentation building

forgot to change that

.gitlab-ci.yml

@@ -398,7 +398,7 @@ test-gnu-bin-base:
 pages:
   stage: doc_builds
   script:
-    - source cpp_sisso_env/bin/activate
+    - source cpp_sisso_intel_param_py_env/bin/activate
     - cd docs/
     - make html
     - mv _build/html/ ../public