Updated node.js dependency in Jupyter installer from 14.* to 15.*.

This allows it to work with Mac ARM architecture (for which there is no
14.* binary) while still working for JupyterLab 2.*.

Author: seidewitz

org.omg.sysml.jupyter.installer/install.sh

@@ -33,7 +33,7 @@ java -version
 
 echo "--- Step 3: Installing Jupyter SysML kernel and dependencies ---"
 jupyter kernelspec remove sysml -f > /dev/null 2>&1 || true
-conda install "jupyter-sysml-kernel=$SYSML_VERSION" python=3.* jupyterlab=2.* graphviz=2.* nodejs=14.* -c conda-forge -y
+conda install "jupyter-sysml-kernel=$SYSML_VERSION" python=3.* jupyterlab=2.* graphviz=2.* nodejs=15.* -c conda-forge -y
 
 echo "--- Step 4: Installing JupyterLab SysML extension ---"
 jupyter labextension uninstall @systems-modeling/jupyterlab-sysml > /dev/null 2>&1 || true