chore(deps): bump @c8y/bootstrap from 1019.2.9 to 1019.4.8 in /frontend

Bumps @c8y/bootstrap from 1019.2.9 to 1019.4.8.

---
updated-dependencies:
- dependency-name: "@c8y/bootstrap"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -31,7 +31,7 @@
     "@angular/platform-browser": "^16.2.0",
     "@angular/platform-browser-dynamic": "^16.2.0",
     "@angular/router": "^16.2.0",
-    "@c8y/bootstrap": "1019.2.9",
+    "@c8y/bootstrap": "1019.4.8",
     "@c8y/client": "1019.2.9",
     "@c8y/devkit": "1019.2.9",
     "@c8y/ngx-components": "1019.2.9",