Cliff Click solution seems to be not handling collisions properly

Hi @cliffclick 

It seems your code relies that `uhash` is unique, but here is an example of collision:

- Khān
- Shām

https://github.com/gunnarmorling/1brc/blob/main/src/main/java/dev/morling/onebrc/CalculateAverage_cliffclick.java#L278

I discovered this because I ran your code, and the output is different for the `create_measurements3.sh`