Bump syn from 2.0.90 to 2.0.91

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.90 to 2.0.91.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.90...2.0.91)

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

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

crates/gosub_webinterop/Cargo.toml

@@ -6,7 +6,7 @@ authors = ["Gosub Community <info@gosub.io>"]
 license = "MIT"
 
 [dependencies]
-syn = { version = "2.0.90", features = ["full", "extra-traits"] }
+syn = { version = "2.0.91", features = ["full", "extra-traits"] }
 quote = { version = "1.0.37", features = [] }
 proc-macro2 = "1.0.92"
 serde = { version = "1.0.216", features = ["derive"] }