Sort classes inside className in Astro (#215)

* Update lockfile

* Add `className` to sortable properties in Astro

When using Astro with React you’d also want to sort `className` in addition to `class` and `class:list`. While we might be able to do some work to figure out if the element the attribute is on is a React component it seems unnecessary and I think it’s reasonable to have this enabled all the time.

* Update changelog

Author: thecrypticace

CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-- Nothing yet!
+### Fixed
+
+- Sort classes inside `className` in Astro ([#215](https://github.com/tailwindlabs/prettier-plugin-tailwindcss/pull/215))
 
 ## [0.5.4] - 2023-08-31