Track tokio performance regression (1.48) and upcoming fix in 1.49

[eval-exec]

Benchmark results show ~4% performance slowdown in CKB due to the update to [email protected] compared to the previous version. https://github.com/tokio-rs/tokio/issues/7692

A fix addressing this slowdown has been merged upstream and is expected in the upcoming [email protected] release.

Since [email protected] is not yet released, this issue tracks the performance impact and plans to upgrade once 1.49 is published.

• Observed ~4% slowdown in benchmarks with [email protected]
• Upstream includes a fix for this performance regression
• [email protected] release is pending

We should plan to upgrade tokio to 1.49 after its release to regain performance.