Update dependency ex_doc to ~> 0.40

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ex_doc (source)	dev	patch	~> 0.29 → ~> 0.40

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
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• you click the rebase/retry checkbox if found above, or
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The artifact failure details are included below:

File name: elixir/mix.lock

Command failed: install-tool elixir v1.20.1