Upgrade ecto & elixir versions

[anaPerezGhiglia]

Changes

• Upgrade Ecto to version that includes fix to ecto.dump adding create/drop/use statements elixir-ecto/ecto_sql#539
  • So we don't have to edit the dump file by-hand for the file to make sense. This is "blocking" new migrations (it's actually not a strict blocker, but definitively a big pain)
• Upgrade elixir because Ecto new version requires it

Considerations 👀

• When deploying this to stg we should remove the --log-sql parameter from db-migrate container since it's no longer a valid parameter
• This actually may apply to other instances deployments (production does not have that parameter configured)

[ysbaddaden]

No deprecations to fix in Elixir 1.11? Nice.