Update Rust crate smol to v2 (#57)

Author: renovate[bot]

async-vfs-os/Cargo.toml

@@ -15,7 +15,7 @@ async-vfs = { path = "../async-vfs", version = "^0.56.0" }
 cfg-if = "1.0.0"
 futures-lite = "2.1.0"
 async-std = { version = "1.12.0", features = [ "attributes" ], optional = true }
-smol = { version = "1.3.0", optional = true }
+smol = { version = "2.0.0", optional = true }
 smol-potat = { version = "1.1.2", optional = true }
 tokio = { version = "1.35.0", optional = true, features = ["full", "test-util"] }
 async-compat = { version = "0.2.3", optional = true }