fix(sncast): add build_tool field to voyager request body (#3750)

<!-- Reference any GitHub issues resolved by this PR -->

Closes #3747

## Introduced changes

<!-- A brief description of the changes -->

- adds `build_tool` field to voyager verify request body

## Checklist

<!-- Make sure all of these are complete -->

- [x] Linked relevant issue
- [ ] Updated relevant documentation
- [ ] Added relevant tests
- [x] Performed self-review of the code
- [ ] Added changes to `CHANGELOG.md`

Author: Isaac-DeFrain

crates/sncast/src/starknet_commands/verify/voyager.rs

@@ -40,6 +40,7 @@ pub struct Body {
     #[serde(rename = "name")]
     pub contract_name: String,
     pub package_name: String,
+    pub build_tool: String,
     pub license: Option<String>,
     pub files: HashMap<String, String>,
 }
@@ -345,6 +346,7 @@ impl<'a> VerificationInterface<'a> for Voyager<'a> {
             contract_name: contract_name.clone(),
             license: selected.manifest_metadata.license.clone(),
             package_name: selected.name,
+            build_tool: "scarb".to_string(),
             files: files
                 .iter()
                 .map(|(name, path)| -> Result<(String, String)> {