Update lalrpop-util requirement from 0.20 to 0.21

Updates the requirements on [lalrpop-util](https://github.com/lalrpop/lalrpop) to permit the latest version.
- [Changelog](https://github.com/lalrpop/lalrpop/blob/master/RELEASES.md)
- [Commits](lalrpop/lalrpop@0.20.0...0.20.2)

---
updated-dependencies:
- dependency-name: lalrpop-util
  dependency-type: direct:production
...

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

Cargo.toml

@@ -28,7 +28,7 @@ folidity-verifier = { path = "crates/verifier" }
 folidity-emitter = { path = "crates/emitter" }
 derive-node = { path = "crates/derive_node" }
 logos = "0.14"
-lalrpop-util = "0.20"
+lalrpop-util = "0.21"
 lalrpop = "0.20"
 thiserror = "1.0"
 syn = "2.0"