build(deps): bump @radix-ui/react-separator in /frontend

Bumps [@radix-ui/react-separator](https://github.com/radix-ui/primitives/tree/HEAD/packages/react/separator) from 1.1.9 to 1.1.15.
- [Changelog](https://github.com/radix-ui/primitives/blob/main/packages/react/separator/CHANGELOG.md)
- [Commits](https://github.com/radix-ui/primitives/commits/HEAD/packages/react/separator)

---
updated-dependencies:
- dependency-name: "@radix-ui/react-separator"
  dependency-version: 1.1.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

frontend/package.json

@@ -29,7 +29,7 @@
     "@radix-ui/react-radio-group": "^1.4.7",
     "@radix-ui/react-scroll-area": "^1.2.11",
     "@radix-ui/react-select": "^2.3.7",
-    "@radix-ui/react-separator": "^1.1.9",
+    "@radix-ui/react-separator": "^1.1.15",
     "@radix-ui/react-slider": "^1.4.7",
     "@radix-ui/react-slot": "^1.2.5",
     "@radix-ui/react-switch": "^1.3.0",