Update Rust crate tokio to 1.46.1

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
tokio (source)	workspace.dependencies	patch	1.46.0 -> 1.46.1

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Release Notes

tokio-rs/tokio (tokio)

v1.46.1: Tokio v1.46.1

Compare Source

1.46.1 (July 4th, 2025)

This release fixes incorrect spawn locations in runtime task hooks for tasks
spawned using tokio::spawn rather than Runtime::spawn. This issue only
effected the spawn location in TaskMeta::spawned_at, and did not effect task
locations in Tracing events.

Unstable

• runtime: add TaskMeta::spawn_location tracking where a task was spawned
  (#​7440)

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