Update vendors/onion-mkdocs digest to 08664bf - autoclosed

This MR contains the following updates:

Package	Update	Change
vendors/onion-mkdocs	digest	438cc17 -> 08664bf

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Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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This MR has been generated by Renovate Bot.

vendors/onion-mkdocs

-Subproject commit 438cc17ef8345620bb33f6a0075ac92f0c9b3380
+Subproject commit 08664bfb9f30c82bd9a7d79c83ea4d33c1ffa151