build(deps): bump syn from 1.0.27 to 1.0.28

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.27 to 1.0.28.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@1.0.27...1.0.28)

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

Author: dependabot-preview[bot]

Cargo.lock

@@ -11,5 +11,5 @@ proc-macro = true
 quote = "1.0.6"
 
 [dependencies.syn]
-version = "1.0.27"
+version = "1.0.28"
 features = ["full"]