docs: changeset

Author: trueberryless

.changeset/hip-maps-judge.md

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+---
+"starlight-sidebar-topics-dropdown": minor
+---
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+Adds support for Astro v6, drops support for Astro v5.
+
+⚠️ **BREAKING CHANGE:** The minimum supported version of Starlight is now `0.38.0`.
+
+Please follow the [upgrade guide](https://github.com/withastro/starlight/releases/tag/%40astrojs%2Fstarlight%400.38.0) to update your project.