Sync svelte docs (#1914)

sync svelte docs

Co-authored-by: svelte-docs-bot[bot] <196124396+svelte-docs-bot[bot]@users.noreply.github.com>

Author: github-actions[bot]

apps/svelte.dev/content/docs/svelte/03-template-syntax/17-style.md

@@ -43,3 +43,9 @@ even over `!important` properties:
 <div style:color="red" style="color: blue">This will be red</div>
 <div style:color="red" style="color: blue !important">This will still be red</div>
 ```
+
+You can set CSS custom properties:
+
+```svelte
+<div style:--columns={columns}>...</div>
+```

apps/svelte.dev/package.json

@@ -75,7 +75,7 @@
 		"satori": "^0.19.2",
 		"satori-html": "^0.3.2",
 		"sv": "^0.14.1",
-		"svelte": "^5.53.5",
+		"svelte": "^5.55.1",
 		"svelte-check": "^4.4.3",
 		"svelte-preprocess": "^6.0.3",
 		"tiny-glob": "^0.2.9",