Release astro@4.9.3 · withastro/astro

#11171 ff8004f Thanks @Princesseuh! - Guard globalThis.astroAsset usage in proxy code to avoid errors in wonky situations
#11178 1734c49 Thanks @theoephraim! - Improves isPromise utility to check the presence of then on an object before trying to access it - which can cause undesired side-effects on Proxy objects
#11183 3cfa2ac Thanks @66Leo66! - Suggest pnpm dlx instead of pnpx in update check.
#11147 2d93902 Thanks @kitschpatrol! - Fixes invalid MIME types in Picture source elements for jpg and svg extensions, which was preventing otherwise valid source variations from being shown by the browser
#11141 19df89f Thanks @ematipico! - Fixes an internal error that prevented the AstroContainer to render the Content component.

You can now write code similar to the following to render content collections:
```
const entry = await getEntry(collection, slug);
const { Content } = await entry.render();
const content = await container.renderToString(Content);
```
#11170 ba20c71 Thanks @matthewp! - Retain client scripts in content cache

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