Update tokio-serde requirement from 0.8.0 to 0.9.0 (#5)

Updates the requirements on [tokio-serde](https://github.com/carllerche/tokio-serde) to permit the latest version.
- [Commits](https://github.com/carllerche/tokio-serde/commits)

---
updated-dependencies:
- dependency-name: tokio-serde
  dependency-type: direct:production
...

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

Cargo.toml

@@ -60,7 +60,7 @@ tarpc = {version = "0.33.0", features = ["full"]}
 anyhow = "1.0.75"
 tracing = "0.1.40"
 service = "0.0.0"
-tokio-serde = "0.8.0"
+tokio-serde = "0.9.0"
 tracing-subscriber = "0.3.17"
 futures-util = "0.3.29"
 actix_block_ai_crawling = "0.2.8"