Upgrade Externals October 2025

[jwnimmer-tri]

Follow Semi-automated monthly upgrades documentation.

Prior issue (September): #23365.

• [workspace] Upgrade vtk_internal to latest commit #23374
• Upgrade externals October 2025 #23498
• Upgrade gz_math, gz_utils, sdformat to latest #23499
• [workspace] Upgrade python venv (mac) to latest #23500
• [workspace] Upgrade crate_universe to latest #23504
• [workspace] Upgrade llvm to 20.1.7 #23516
• [workspace] Upgrade curl_internal to latest release 8.16.0 #23517
• [workspace] Upgrade libtiff_internal to latest release v4.7.1 #23518