v.25.12Improvement

Bump chdig

Bump chdig (a command-line ClickHouse diagnostic tool) to v25.12.1. #91394 (Azat Khuzhin).
Updated the ClickHouse diagnostic tool chdig to version 25.12.1.

Why it matters

This update brings improvements and bug fixes to the chdig tool, which aids in diagnosing and troubleshooting ClickHouse clusters more effectively.

How to use it

Users can download or upgrade to chdig version 25.12.1 from the official GitHub releases page and then use it as usual for ClickHouse diagnostics.