Update async-graphql requirement from 6.0.11 to 7.0.3

---
updated-dependencies:
- dependency-name: async-graphql
  dependency-type: direct:production
...

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

examples/web_app_graphql/Cargo.toml

@@ -9,7 +9,7 @@ authors = ["Eugene Korir <korir16071@gmail.com>"]
 [dependencies]
 actix-cors = "0.7.0"
 actix-web = "4.4.0"
-async-graphql = "6.0.11"
+async-graphql = "7.0.3"
 async-graphql-actix-web = "6.0.11"
 diesel = { version = "2.1.4", features = ["postgres"] }
 diesel-async = { version = "0.4.1", features = ["postgres", "deadpool"] }