v0.6.7: Update base image, Python, OpenSSL
Update the base container image for Elekto, especially Python and OpenSSL.
Anyone using Elekto as a container should use this image as the most current-and-secure. Do not use v0.6.6.
Folks using Elekto from source can continue to use v0.6.6; this update affects the container image only.
Thanks to @mscherer