Update torch to 2.6

[jleibs]

Hoping this fixes the nightly build issues from:

• https://github.com/rerun-io/rerun/actions/runs/13690489258/job/38284260123

[github-actions]

Web viewer built successfully. If applicable, you should also test it:

• I have tested the web viewer

Result	Commit	Link	Manifest
✅	8ee6a50	https://rerun.io/viewer/pr/9225	+nightly +main

^{Note: This comment is updated whenever you push a commit.}

[github-actions]

Latest documentation preview deployed successfully.

Result	Commit	Link
✅	8ee6a50	https://landing-1jsb95bcv-rerun.vercel.app/docs

^{Note: This comment is updated whenever you push a commit.}

[emilk]

@rerun-bot full-check

[github-actions]

Started a full build: https://github.com/rerun-io/rerun/actions/runs/13707376479