Bump Python version we test and build on

Author: rocky

admin-tools/pyenv-versions

@@ -5,4 +5,4 @@ if [[ $0 == ${BASH_SOURCE[0]} ]] ; then
 	echo "This script should be *sourced* rather than run directly through bash"
 	exit 1
 fi
-export PYVERSIONS='3.6.13 3.7.10 3.8.10 3.9.5'
+export PYVERSIONS='3.6.14 3.7.11 3.8.11 3.9.6'