chore(deps): update dependency io_bazel_stardoc to v0.5.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
io_bazel_stardoc	git_repository	minor	0.4.0 -> 0.5.0

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Release Notes

bazelbuild/stardoc

### [`v0.5.0`](https://togithub.com/bazelbuild/stardoc/blob/master/CHANGELOG.md#Release-050) [Compare Source](https://togithub.com/bazelbuild/stardoc/compare/0.4.0...0.5.0) This release includes many fixes for Stardoc's markdown output, plus: **New Features** - Raw protobuf output via `format = "proto"` ([#​20](https://togithub.com/bazelbuild/stardoc/issues/20)) - Stardoc now outputs documentation for macro returns and deprecations ([#​75](https://togithub.com/bazelbuild/stardoc/issues/75)) as well as module (file) docstrings ([#​100](https://togithub.com/bazelbuild/stardoc/issues/100)) **Contributors** Alexandre Rostovtsev, Alex Eagle, Andrew Z Allen, Chris Rebert, c-parsons, Ivo List, Jon Brandvein, Laurent Le Brun, Max Vorobev, pbatg, Philipp Wollermann, Samuel Giddins, Thomas Van Lenten, Tiago Quelhas, Xùdōng Yáng, Yiting Wang

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