Update async-session requirement from 2.0.0 to 3.0.0

Updates the requirements on [async-session](https://github.com/http-rs/async-session) to permit the latest version.
- [Release notes](https://github.com/http-rs/async-session/releases)
- [Commits](http-rs/async-session@v2.0.0...v3.0.0)

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

Author: dependabot[bot]

Cargo.toml

@@ -13,7 +13,7 @@ categories = ["web-programming::http-server", "web-programming", "database"]
 
 [dependencies]
 redis = { version = "0.17.0", features = ["aio"] }
-async-session = "2.0.0"
+async-session = "3.0.0"
 
 [dev-dependencies]
 async-std = { version = "1.6.2", features = ["attributes"] }