Bump tokio version to 1.30 to avoid duplicate socket2 dependency

[iawia002]

In #8983, we introduced the redis dependency, which relies on socket2 0.5. This conflicts with our existing version 0.4, leading to cargo deny throwing the following error when trying to merge #9032 (https://github.com/bytecodealliance/wasmtime/actions/runs/10147488558/job/28058006599).

error[duplicate]: found 2 duplicate entries for crate 'socket2'
    ┌─ /home/runner/work/wasmtime/wasmtime/Cargo.lock:224:1
    │  
224 │ ╭ socket2 0.4.9 registry+https://github.com/rust-lang/crates.io-index
225 │ │ socket2 0.5.7 registry+https://github.com/rust-lang/crates.io-index
    │ ╰───────────────────────────────────────────────────────────────────^ lock entries

Therefore, this patch updates the version of tokio from 1.29.1 to 1.30. With this update, we will no longer have duplicate socket2 dependencies, as both will depend on version 0.5.

NOTE: I could also downgrade the redis version to 0.25.0, which relies on socket2 0.4, but this version has significant bugs and has been yanked.