chore(deps): update dependency ex_doc to ~> 0.40

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ex_doc (source)	dev	patch	~> 0.31 → ~> 0.40

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Release Notes

elixir-lang/ex_doc (ex_doc)

v0.40.4

Compare Source

• Enhancements

  • Add :api_reference_noindex option to keep search engines from indexing api-reference.html

  • Generate reproducible HTML and EPUB output

  • Link HexDocs packages through their per-package subdomains

  • Bug fixes

    • Preserve in-page anchors during Swup navigation and fully reload navigation between ExDoc builds
    • Format Elixir specs consistently regardless of their source line numbers
    • Autolink the Erlang/OTP 29 built-in record/0 type
    • Fix focus outline positioning for top-content heading action icons

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