fix: increase timeout for rust-ci to 45 minutes for now (#15948)

https://github.com/openai/codex/pull/15478 raised the timeout to 35
minutes for `windows-arm64` only, though I just hit 35 minutes on
https://github.com/openai/codex/actions/runs/23628986591/job/68826740108?pr=15944,
so let's just increase it to 45 minutes. As noted, I'm hoping that we
can bring it back down once we no longer have two copies of the `tui`
crate.