build(deps-dev): bump @jupyterlab/galata in /ui-tests

Bumps [@jupyterlab/galata](https://github.com/jupyterlab/jupyterlab) from 5.3.0 to 5.5.0.
- [Release notes](https://github.com/jupyterlab/jupyterlab/releases)
- [Changelog](https://github.com/jupyterlab/jupyterlab/blob/main/RELEASE.md)
- [Commits](https://github.com/jupyterlab/jupyterlab/compare/@jupyterlab/galata@5.3.0...@jupyterlab/galata@5.5.0)

---
updated-dependencies:
- dependency-name: "@jupyterlab/galata"
  dependency-version: 5.5.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

ui-tests/package.json

@@ -15,7 +15,7 @@
   "author": "Project Jupyter",
   "license": "BSD-3-Clause",
   "devDependencies": {
-    "@jupyterlab/galata": "^5.3.0",
+    "@jupyterlab/galata": "^5.5.0",
     "@playwright/test": "^1.57.0",
     "yarn-deduplicate": "^6.0.1"
   }