TMSS-241: Fix npm issue in SAS CI docker

Docker/lofar-ci/Dockerfile_ci_sas

@@ -24,7 +24,6 @@ RUN echo "Installing Nodejs packages..." && \
     yum install -y nodejs && \
     npm -v && \
     node -v && \
-    npm install -g serve && \
-    npm install -g npx
+    npm install -g serve
 
 USER lofarsys
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