Update node:8 Docker digest to 38953a (#3051)
Update node:8 Docker digest to 38953a (#3051)


nteract/nteract,nteract/nteract,rgbkrk/nteract,nteract/nteract,jdfreder/nteract,nteract/composition,jdfreder/nteract,nteract/nteract,rgbkrk/nteract,rgbkrk/nteract,nteract/composition,jdfreder/nteract,rgbkrk/nteract,nteract/nteract,rgbkrk/nteract,jdfreder/nteract,nteract/composition