Update copyright notice year

[stojadin2701]

This patch updates the copyright notice year to 2026.

---

Note

Refreshes legal headers to 2026 across the repository.

• Updates copyright notices in source/header files, scripts, and build configs for flight_computer, ground_station, and telemetry
• No functional or behavioral changes; code remains identical

^{Written by Cursor Bugbot for commit dbb68c4. This will update automatically on new commits. Configure here.}