Update async-fs requirement from 1.3.0 to 2.0.0

Updates the requirements on [async-fs](https://github.com/smol-rs/async-fs) to permit the latest version.
- [Release notes](https://github.com/smol-rs/async-fs/releases)
- [Changelog](https://github.com/smol-rs/async-fs/blob/master/CHANGELOG.md)
- [Commits](smol-rs/async-fs@v1.3.0...v2.0.0)

---
updated-dependencies:
- dependency-name: async-fs
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -17,7 +17,7 @@ exclude = ["/.*"]
 [dependencies]
 async-channel = "2.0.0"
 async-executor = "1.5.0"
-async-fs = "1.3.0"
+async-fs = "2.0.0"
 async-io = "1.12.0"
 async-lock = "3.0.0"
 async-net = "2.0.0"