Update diesel-async requirement from 0.6.1 to 0.7.3

Updates the requirements on [diesel-async](https://github.com/weiznich/diesel_async) to permit the latest version.
- [Release notes](https://github.com/weiznich/diesel_async/releases)
- [Changelog](https://github.com/weiznich/diesel_async/blob/main/CHANGELOG.md)
- [Commits](weiznich/diesel_async@v0.6.1...v0.7.3)

---
updated-dependencies:
- dependency-name: diesel-async
  dependency-version: 0.7.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/web_app_graphql/Cargo.toml

@@ -12,7 +12,7 @@ actix-web = "4.4.0"
 async-graphql = "6.0.11"
 async-graphql-actix-web = "6.0.11"
 diesel = { version = "2.1.4", features = ["postgres"] }
-diesel-async = { version = "0.6.1", features = ["postgres", "deadpool"] }
+diesel-async = { version = "0.7.3", features = ["postgres", "deadpool"] }
 diesel_migrations = "2.1.0"
 dotenvy = "0.15.7"
 env_logger = "0.11.3"