Update syn requirement from 1.0 to 2.0 in /wasm (#18)

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@1.0.0...2.0.0)

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

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

Author: dependabot[bot]

wasm/Cargo.toml

@@ -24,6 +24,6 @@ crate-type = ["cdylib", "rlib"]
 proc-macro2 = { git = "https://github.com/dtolnay/watt" }
 
 [dependencies]
-syn = { version = "1.0", features = ["full", "fold"] }
+syn = { version = "2.0", features = ["full", "fold"] }
 quote = "1.0"
 proc-macro2 = "1.0"