Stop forcing the container base env to Python 3.11

conda-build builds the full python matrix in its own isolated envs, so
the base version doesn't matter. Forcing it downgrades the fresh base
conda, which is fragile.

Signed-off-by: Patrick Avery <patrick.avery@kitware.com>

Author: psavery

.github/workflows/container_build.sh

@@ -16,9 +16,6 @@ chmod a+x Miniconda3-latest-Linux-x86_64.sh
 # Activate conda
 source $HOME/miniconda3/bin/activate
 
-# The base needs to have the same python version (3.11, right now)
-conda install --override-channels -c conda-forge python=3.11 -y
-
 # Set up the hexrd channel
 conda create --override-channels -c conda-forge -y -n hexrd python=3.11
 conda activate hexrd