Fix redundant import for Dtaa.ByteString.Unsafe

Fixes:
```
libraries/text/src/Data/Text/Lazy/Encoding.hs:62:1: error: [-Wunused-imports, -Werror=unused-imports]
    The qualified import of ‘Data.ByteString.Unsafe’ is redundant
      except perhaps to import instances from ‘Data.ByteString.Unsafe’
    To import instances alone, use: import Data.ByteString.Unsafe()
   |
62 | import qualified Data.ByteString.Unsafe as B
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```