chore: clippy fix (#3860)

# Description

## Problem\*

Resolves <!-- Link to GitHub Issue -->

## Summary\*



## Additional Context



## Documentation\*

Check one:
- [ ] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[Exceptional Case]** Documentation to be submitted in a separate
PR.

# PR Checklist\*

- [ ] I have tested the changes locally.
- [ ] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

compiler/noirc_frontend/src/tests.rs

@@ -21,7 +21,6 @@ mod test {
     use crate::hir::Context;
     use crate::node_interner::{NodeInterner, StmtId};
 
-    use crate::graph::CrateGraph;
     use crate::hir::def_collector::dc_crate::DefCollector;
     use crate::hir_def::expr::HirExpression;
     use crate::hir_def::stmt::HirStatement;