Bump svelte in /installer-gui in the security group across 1 directory

Bumps the security group with 1 update in the /installer-gui directory: [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte).


Updates `svelte` from 5.55.4 to 5.55.7
- [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@5.55.7/packages/svelte)

---
updated-dependencies:
- dependency-name: svelte
  dependency-version: 5.55.7
  dependency-type: direct:development
  dependency-group: security
...

Signed-off-by: dependabot[bot] <support@github.com>

installer-gui/package.json

@@ -33,7 +33,7 @@
         "globals": "^17.5.0",
         "prettier": "^3.8.3",
         "prettier-plugin-svelte": "^3.5.1",
-        "svelte": "^5.55.4",
+        "svelte": "^5.55.7",
         "svelte-check": "^4.4.6",
         "typescript": "~6.0.3",
         "typescript-eslint": "^8.58.2",