Bump syn from 1.0.109 to 2.0.85

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.109 to 2.0.85.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@1.0.109...2.0.85)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -10,7 +10,7 @@ description = "Macros for the `shopify_function` crate."
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0", features = ["full"] }
+syn = { version = "2.0", features = ["full"] }
 quote = "1.0"
 proc-macro2 = "1.0.89"
 convert_case = "0.6.0"