Sync credo checks with other projects and fix

[fhunleth]

No description provided.

[Copilot]

Pull request overview

This PR synchronizes Credo configuration and fixes code style issues to comply with stricter Credo checks, specifically StrictModuleLayout and Specs.

Changes:

• Enabled strict mode in Credo configuration and added StrictModuleLayout and Specs checks
• Updated dependencies (credo, ex_doc, makeup_erlang) to newer versions
• Reorganized module attributes to follow Credo's strict module layout conventions (moduledoc, behaviour, use, alias, require order)
• Added type specifications to test helper functions

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.credo.exs	Enabled strict mode and added StrictModuleLayout and Specs checks
mix.lock	Updated credo, ex_doc, and makeup_erlang dependencies
lib/ssh_subsystem_fwup/fwup_port.ex	Moved require Logger after @moduledoc per strict layout rules
lib/ssh_subsystem_fwup.ex	Reorganized alias and require statements after @behaviour per strict layout rules
lib/mix/tasks/upload.ex	Moved use Mix.Task after @moduledoc per strict layout rules
lib/mix/tasks/firmware.gen.script.ex	Moved use Mix.Task and module attributes after @moduledoc; replaced moduledoc interpolation with literal string
test/ssh_subsystem_fwup_test.exs	Added @spec annotations to test helper functions

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.