build(deps): update syn requirement from 1.0.74 to 2.0.4

Updates the requirements on [syn](https://github.com/dtolnay/syn) to permit the latest version.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/commits/2.0.4)

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

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

Author: dependabot[bot]

uefi-macros/Cargo.toml

@@ -16,7 +16,7 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.28"
 quote = "1.0.9"
-syn = { version = "1.0.74", features = ["full"] }
+syn = { version = "2.0.4", features = ["full"] }
 
 [dev-dependencies]
 trybuild = "1.0.61"