Bump syn from 2.0.87 to 2.0.90 (#996)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.87 to 2.0.90.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.87...2.0.90)

---
updated-dependencies:
- dependency-name: syn
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.toml

@@ -49,7 +49,7 @@ serde = { version = "1.0.215", features = ["derive"] }
 serde_json = "1.0.133"
 serde_urlencoded = "0.7.1"
 serde_yaml = "0.9"
-syn = { version = "2.0.87", features = ["parsing"] }
+syn = { version = "2.0.90", features = ["parsing"] }
 thiserror = "2.0.6"
 tokio = { version = "1.41.1", features = ["rt", "net"] }
 # change when publishing