Let the Python patch version float

Author: alasdairtran

base-notebook/Dockerfile

@@ -71,7 +71,7 @@ RUN cd /tmp && \
     $CONDA_DIR/bin/conda config --system --set show_channel_urls true && \
     $CONDA_DIR/bin/conda install --quiet --yes conda="${MINICONDA_VERSION%.*}.*" && \
     $CONDA_DIR/bin/conda update --all --quiet --yes && \
-    conda list python | grep '^python ' | tr -s ' ' | cut -d ' ' -f 1,2 >> $CONDA_DIR/conda-meta/pinned && \
+    conda list python | grep '^python ' | tr -s ' ' | cut -d '.' -f 1,2 | sed 's/$/.*/' >> $CONDA_DIR/conda-meta/pinned && \
     conda clean -tipsy && \
     rm -rf /home/$NB_USER/.cache/yarn && \
     fix-permissions $CONDA_DIR && \