Counter-Strike: Source update fixes Linux bugs and client crash

A new Counter-Strike: Source update is out and will apply automatically when you restart the game. It focuses on security and stability, including a few community-contributed fixes.

• Fixed a client crash related to a missing HUDAutoAim element (community fix from flower).
• Fixed an incorrect winter holiday check on Linux servers (community fix from Irineu).
• Fixed a bug where certain custom maps failed to load assets correctly on Linux.