Bump tslib from 2.6.3 to 2.7.0 in /frontend

Bumps [tslib](https://github.com/Microsoft/tslib) from 2.6.3 to 2.7.0.
- [Release notes](https://github.com/Microsoft/tslib/releases)
- [Commits](microsoft/tslib@v2.6.3...v2.7.0)

---
updated-dependencies:
- dependency-name: tslib
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -33,7 +33,7 @@
     "proj4": "^2.12.0",
     "resize-observer-polyfill": "^1.5.1",
     "rxjs": "~7.8.1",
-    "tslib": "^2.6.3",
+    "tslib": "^2.7.0",
     "zone.js": "~0.14.10"
   },
   "devDependencies": {