[264463] Update Hex libraries, requires Elixir 1.11

[Double-oxygeN]

https://acsmine.tok.access-company.com/redmine/issues/264463

---

The minimum supported version of Elixir will change to 1.11 because the following library updates require Elixir 1.11+:

• ex_doc: 0.29.4
• excoveralls: 0.16.1