Bump svelte from 5.53.6 to 5.55.8 in /src/ifctester/webapp

Bumps [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte) from 5.53.6 to 5.55.8.
- [Release notes](https://github.com/sveltejs/svelte/releases)
- [Changelog](https://github.com/sveltejs/svelte/blob/main/packages/svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/svelte/commits/svelte@5.55.8/packages/svelte)

---
updated-dependencies:
- dependency-name: svelte
  dependency-version: 5.55.8
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit 1906481a01)

src/ifctester/webapp/package.json

@@ -22,7 +22,7 @@
     "clsx": "^2.1.1",
     "mode-watcher": "^1.1.0",
     "sass-embedded": "^1.89.0",
-    "svelte": "^5.53.6",
+    "svelte": "^5.55.8",
     "svelte-check": "^4.0.0",
     "svelte-sonner": "^1.0.5",
     "tailwind-merge": "^3.3.0",