Bump ts-jest from 29.3.4 to 29.4.1 in /frontend

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 29.3.4 to 29.4.1.
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/main/CHANGELOG.md)
- [Commits](https://github.com/kulshekhar/ts-jest/compare/v29.3.4...v29.4.1)

---
updated-dependencies:
- dependency-name: ts-jest
  dependency-version: 29.4.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

frontend/sync-client/package.json

@@ -23,7 +23,7 @@
         "@types/jest": "^30.0.0",
         "@types/node": "^22.15.30",
         "jest": "^30.1.1",
-        "ts-jest": "^29.3.4",
+        "ts-jest": "^29.4.1",
         "ts-loader": "^9.5.2",
         "tslib": "2.8.1",
         "typescript": "5.8.3",