Single out bokeh dependency

Author: TimoRoth

binder/Dockerfile

@@ -33,16 +33,16 @@ RUN ${PIP} install --no-cache-dir \
         nteract_on_jupyter
 
 # OGGM(-Hub) requirements
-RUN ${PIP} install --no-cache-dir --no-binary scikit-learn \
+RUN ${PIP} install --no-cache-dir --no-binary scikit-learn,pyct \
         scikit-learn \
+        pyct \
         ipympl && \
     ${PIP} install --no-cache-dir --no-binary :all: --only-binary jupyterlab-pygments \
         nbgitpuller \
         nbserverproxy \
         graphviz \
         bokeh \
         param \
-        pyct \
         shapely \
         parambokeh \
         seaborn \