Bump tokio from 1.36.0 to 1.37.0 in /backend

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.36.0 to 1.37.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.36.0...tokio-1.37.0)

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

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

backend/Cargo.toml

@@ -44,7 +44,7 @@ sea-orm = { version = "0.11.2", default-features = false, features = [
 sea-orm-migration = { version = "0.11.3" }
 serde = { version = "1.0.197" }
 thiserror = { version = "1.0.58" }
-tokio = { version = "1.35.1", features = ["macros", "rt-multi-thread"] }
+tokio = { version = "1.37.0", features = ["macros", "rt-multi-thread"] }
 tracing = { version = "0.1.40" }
 tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
 url = { version = "2.5.0" }