This update for chromium, gn fixes the following issues:

- Chromium 140.0.7339.80 (boo#1249093):
* new permission prompt for local network access
* CVE-2025-9864: Use after free in V8
* CVE-2025-9865: Inappropriate implementation in Toolbar
* CVE-2025-9866: Inappropriate implementation in Extensions
* CVE-2025-9867: Inappropriate implementation in Downloads
* Various fixes from internal audits, fuzzing and other initiatives