Bump syn from 1.0.72 to 1.0.73 (#121)

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.72 to 1.0.73.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@1.0.72...1.0.73)

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

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

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

Author: dependabot[bot]

Cargo.lock

@@ -18,5 +18,5 @@ version = "1.0.26"
 version = "1.0.9"
 
 [dependencies.syn]
-version = "1.0.71"
+version = "1.0.73"
 features = [ "full", "derive", "extra-traits" ]