Bump ecto_sql from 3.1.5 to 3.1.6 (#487)
Bump ecto_sql from 3.1.5 to 3.1.6 (#487)

Bumps [ecto_sql](https://github.com/elixir-ecto/ecto_sql) from 3.1.5 to 3.1.6.
- [Release notes](https://github.com/elixir-ecto/ecto_sql/releases)
- [Changelog](https://github.com/elixir-ecto/ecto_sql/blob/master/CHANGELOG.md)
- [Commits](https://github.com/elixir-ecto/ecto_sql/compare/v3.1.5...v3.1.6)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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