chore: coverage minimum of 80% (#213)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
- Set the code coverage target to 80%, ensuring more consistent and
reliable test coverage.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

codecov.yml

@@ -5,7 +5,7 @@ coverage:
         # Fail the build if the coverage decreases by more than 1%
         threshold: 1%
         # Set a minimum coverage percentage that must be met
-        target: auto
+        target: 80%
         # The status context shown in GitHub (optional)
         name: Coverage Check