cargo: bump async-channel from 1.7.1 to 1.8.0

Bumps [async-channel](https://github.com/smol-rs/async-channel) from 1.7.1 to 1.8.0.
- [Release notes](https://github.com/smol-rs/async-channel/releases)
- [Changelog](https://github.com/smol-rs/async-channel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/smol-rs/async-channel/compare/v1.7.1...v1.8.0)

---
updated-dependencies:
- dependency-name: async-channel
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

deltachat-jsonrpc/Cargo.toml

@@ -19,7 +19,7 @@ num-traits = "0.2"
 serde = { version = "1.0", features = ["derive"] }
 tempfile = "3.3.0"
 log = "0.4"
-async-channel = { version = "1.6.1" }
+async-channel = { version = "1.8.0" }
 futures = { version = "0.3.25" }
 serde_json = "1.0.87"
 yerpc = { version = "^0.3.1", features = ["anyhow_expose"] }