Update lapin requirement from 2.3 to 3.7 in /reference-apps/rust (#23)

Updates the requirements on [lapin](https://github.com/amqp-rs/lapin) to permit the latest version.
- [Changelog](https://github.com/amqp-rs/lapin/blob/main/CHANGELOG.md)
- [Commits](amqp-rs/lapin@lapin-2.3.0...v3.7.2)

---
updated-dependencies:
- dependency-name: lapin
  dependency-version: 3.7.2
  dependency-type: direct:production
...

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Author: dependabot[bot]

reference-apps/rust/Cargo.toml

@@ -17,6 +17,6 @@ tokio-postgres = "0.7"
 mysql_async = "0.35"
 mongodb = "3.1"
 redis = { version = "0.27", features = ["tokio-comp", "cluster-async"] }
-lapin = "2.3"
+lapin = "3.7"
 prometheus = "0.13"
 lazy_static = "1.4"