chore: Update bcrypt_elixir requirement from ~> 2.0 to ~> 3.1

Updates the requirements on [bcrypt_elixir](https://github.com/riverrun/bcrypt_elixir) to permit the latest version.
- [Changelog](https://github.com/riverrun/bcrypt_elixir/blob/master/CHANGELOG.md)
- [Commits](riverrun/bcrypt_elixir@v2.0.0...v3.1.0)

---
updated-dependencies:
- dependency-name: bcrypt_elixir
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

apps/api_accounts/mix.exs

@@ -55,7 +55,7 @@ defmodule ApiAccounts.Mixfile do
       {:ex_aws_dynamo, "~> 4.0"},
       {:jason, "~> 1.0"},
       {:comeonin, "~> 5.1"},
-      {:bcrypt_elixir, "~> 2.0"},
+      {:bcrypt_elixir, "~> 3.1"},
       {:uuid, "~> 1.1"},
       {:bamboo, "~> 1.0"},
       {:bamboo_ses, "~> 0.1.0"},