tag unsafe function as such

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (d1240b6) 83.50% compared to head (3082ae9) 83.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1516 +/- ## ======================================= Coverage 83.50% 83.50% ======================================= Files 388 388 Lines 42024 42024 ======================================= + Hits 35092 35093 +1 + Misses 6932 6931 -1 ``` | [Impacted Files](https://app.codecov.io/gh/jorgecarleitao/arrow2/pull/1516?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jorge+Leitao) | Coverage Δ | | |---|---|---| | [src/array/mod.rs](https://app.codecov.io/gh/jorgecarleitao/arrow2/pull/1516?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jorge+Leitao#diff-c3JjL2FycmF5L21vZC5ycw==) | `79.43% <100.00%> (ø)` | | ... and [5 files with indirect coverage changes](https://app.codecov.io/gh/jorgecarleitao/arrow2/pull/1516/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jorge+Leitao)

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