actually utils is unused, so remove it

[eacharles]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (678bdd0) 97.13% compared to head (60456a3) 97.13%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #62 +/- ## ========================================== - Coverage 97.13% 97.13% -0.01% ========================================== Files 32 32 Lines 1676 1675 -1 ========================================== - Hits 1628 1627 -1 Misses 48 48 ``` | [Files](https://app.codecov.io/gh/LSSTDESC/rail_base/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC) | Coverage Δ | | |---|---|---| | [src/rail/evaluation/evaluator.py](https://app.codecov.io/gh/LSSTDESC/rail_base/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3JhaWwvZXZhbHVhdGlvbi9ldmFsdWF0b3IucHk=) | `100.00% <ø> (ø)` | | | [src/rail/evaluation/metrics/cdeloss.py](https://app.codecov.io/gh/LSSTDESC/rail_base/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3JhaWwvZXZhbHVhdGlvbi9tZXRyaWNzL2NkZWxvc3MucHk=) | `100.00% <100.00%> (ø)` | | | [src/rail/evaluation/stats\_groups.py](https://app.codecov.io/gh/LSSTDESC/rail_base/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3JhaWwvZXZhbHVhdGlvbi9zdGF0c19ncm91cHMucHk=) | `100.00% <ø> (ø)` | |

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