nitpick: incosistent casing in Bytes.toBase16 and Bytes.toHex

[Cody Allen]

Bytes.toBase16 maps to the ASCII codes for lowercase characters (a-f). However, Bytes.toHex maps to uppercase characters (A-F). Unison also pretty-prints Bytes values as hex with lowercase characters, so I think that it would be natural to have Bytes.toHex output lower-case characters.

[Rúnar]

I believe this is already fixed in main:

     1 | > catch do 0xsabcdef |> Bytes.toHex
          ⧩
          Right "abcdef"