Bump dependencies and remove some Dialyzer warnings

[optikfluffel]

There are still a couple of them left.

lib/exdgraph/protocol.ex:50:callback_type_mismatch
Callback mismatch for @callback disconnect/2 in DBConnection behaviour.

Expected type:
:ok

Actual type:
nil

lib/exdgraph/protocol.ex:54:callback_type_mismatch
Callback mismatch for @callback handle_begin/2 in DBConnection behaviour.

Expected type:

  {:disconnect, %{:__exception__ => true, :__struct__ => atom(), atom() => _}, _}
  | {:error, %{:__exception__ => true, :__struct__ => atom(), atom() => _}, _}
  | {:ok, _, _}


Actual type:
nil

lib/exdgraph/protocol.ex:58:callback_type_mismatch
Callback mismatch for @callback handle_rollback/2 in DBConnection behaviour.

Expected type:

  {:disconnect, %{:__exception__ => true, :__struct__ => atom(), atom() => _}, _}
  | {:error, %{:__exception__ => true, :__struct__ => atom(), atom() => _}, _}
  | {:ok, _, _}


Actual type:
nil

lib/exdgraph/protocol.ex:62:callback_type_mismatch
Callback mismatch for @callback handle_commit/2 in DBConnection behaviour.

Expected type:

  {:disconnect, %{:__exception__ => true, :__struct__ => atom(), atom() => _}, _}
  | {:error, %{:__exception__ => true, :__struct__ => atom(), atom() => _}, _}
  | {:ok, _, _}


Actual type:
nil

lib/exdgraph/protocol.ex:68:pattern_match
The pattern
{:disconnect, _, _}

can never match the type

  {:error, %{:__exception__ => true, :__struct__ => atom(), atom() => _}, _}
  | {:ok, _, GRPC.Channel}

[coveralls]

Pull Request Test Coverage Report for Build 122

• 1 of 3 (33.33%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.4%) to 69.828%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/exdgraph/protocol.ex	0	2	0.0%

Totals
Change from base Build 119:	-0.4%
Covered Lines:	162
Relevant Lines:	232

---

💛 - Coveralls