Administrivia - use 3.13 in master

Author: rocky

admin-tools/setup-master.sh

@@ -1,13 +1,13 @@
 #!/bin/bash
 # Check out master branch and dependent development master branches
+PYTHON_VERSION=3.13
+
 bs=${BASH_SOURCE[0]}
 if [[ $0 == $bs ]] ; then
     echo "This script should be *sourced* rather than run directly through bash"
     exit 1
 fi
 
-PYTHON_VERSION=3.12
-
 uncompyle6_owd=$(pwd)
 mydir=$(dirname $bs)
 fulldir=$(readlink -f $mydir)