Linter is not catching lines that exceed the characters limit

### Bug Description

Our linter is not catching and reporting back errors when lines in the tested code exceed the character limit. You can see one instance of that happening [here](https://github.com/canonical/mlops-libs/pull/3#discussion_r1504790462).

### To Reproduce

1. Edit a file and add a line with more than 99 characters
2. Run the linter
3. Watch it pass

### Environment

CI or local environment with similar characteristics to the CI.

### Relevant Log Output

```shell
N/A
```

### Additional Context

_No response_