Updated go mod for search fixes

[kristin-kronstain-brown]

Bumps docs-theme-extras to v0.3.17-beta.1 (solo-io/docs-theme-extras#64):

• Search: sites with many version trees no longer freeze the page and then show "No results found". Results don't pop open after you click away while the index loads, and multi-word queries no longer stall the page.

• Navbar dropdowns: keyboard focus opens them, Escape closes them, and a mouse click no longer pins them open.

• Mobile drawer: after you switch docTabs, screen readers announce the tree that is shown instead of an empty drawer.

• Landmarks: the navbar and sidebar <nav> elements have labels, in English and Japanese.

• Version noindex: docs-site/layouts/partials/utils/version-noindex.html now returns the directive string ("noindex, follow" or "") like the module's partial, instead of printing a <meta> tag. The module's head.html folds that result into the single robots tag it writes. Printed markup ended up inside that tag's content attribute, which rendered as an empty content on exactly the pages that should be noindexed.

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