Update trybuild requirement from =1.0.88 to =1.0.89 (#62)

Updates the requirements on [trybuild](https://github.com/dtolnay/trybuild) to permit the latest version.
- [Release notes](https://github.com/dtolnay/trybuild/releases)
- [Commits](dtolnay/trybuild@1.0.88...1.0.89)

---
updated-dependencies:
- dependency-name: trybuild
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -36,5 +36,5 @@ futures-executor = "0.3.15"
 gotham = { version = "0.7", features = ["testing"], default-features = false }
 percent-encoding = "2.1"
 pretty_env_logger = "0.5"
-trybuild = "=1.0.88"
+trybuild = "=1.0.89"
 validator = { version = "0.16", features = ["derive"] }