Update fastrand requirement from 1.8.0 to 2.0.0 (#584)

Updates the requirements on [fastrand](https://github.com/smol-rs/fastrand) to permit the latest version.
- [Release notes](https://github.com/smol-rs/fastrand/releases)
- [Changelog](https://github.com/smol-rs/fastrand/blob/master/CHANGELOG.md)
- [Commits](smol-rs/fastrand@v1.8.0...v2.0.0)

---
updated-dependencies:
- dependency-name: fastrand
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

poem-grpc/Cargo.toml

@@ -37,7 +37,7 @@ serde = { workspace = true, optional = true }
 serde_json = { workspace = true, optional = true }
 rustls.workspace = true
 thiserror.workspace = true
-fastrand = "1.8.0"
+fastrand = "2.0.0"
 
 [build-dependencies]
 poem-grpc-build.workspace = true