chore(deps): update syn requirement from 1.0.109 to 2.0.48

Updates the requirements on [syn](https://github.com/dtolnay/syn) to permit the latest version.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@1.0.109...2.0.48)

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

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

lurk-macros/Cargo.toml

@@ -15,7 +15,7 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.66"
 quote = "1.0.31"
-syn = { version = "1.0.109", features = ["derive", "extra-traits", "full"] }
+syn = { version = "2.0.48", features = ["derive", "extra-traits", "full"] }
 proptest = { workspace = true }
 proptest-derive = { workspace = true }
 serde = { workspace = true, features = ["derive"] }