chore(astro): upgrade to astro 6 with legacy content compatibility

src/pages/glossaire/[...slug].astro

@@ -1,17 +1,17 @@
 ---
 import EditionLayout from "../../layouts/EditionLayout.astro";
-import { getCollection } from "astro:content";
+import { getCollection, render } from "astro:content";
 
 export async function getStaticPaths() {
   const entries = await getCollection("glossaire");
   return entries.map((entry) => ({
-    params: { slug: entry.slug },
+    params: { slug: String(entry.id).replace(/\.(md|mdx)$/i, "") },
     props: { entry },
   }));
 }
 
 const { entry } = Astro.props;
-const { Content } = await entry.render();
+const { Content } = await render(entry);
 ---
 
 <EditionLayout
@@ -26,4 +26,4 @@ const { Content } = await entry.render();
   <h1>{entry.data.term}</h1>
   <p><em>{entry.data.definitionShort}</em></p>
   <Content />
-</EditionLayout>
+</EditionLayout>