CI: upgrade to Elixir 1.11
It's been a while since updating the Elixir version in the CI. This bumps it up to Elixir 1.11. It also makes some adjustments to the cycles job so it can share cache and avoid running unnecessarily.
It's been a while since updating the Elixir version in the CI. This bumps it up to Elixir 1.11. It also makes some adjustments to the cycles job so it can share cache and avoid running unnecessarily.