Log Message:
devel/difftastic: update to 0.50.0

0.50 (released 15th August 2023)

Conflicts
 - Difftastic now supports parsing files with conflict markers, enabling you
   to diff the two conflicting file states.

Parsing
 - Updated Elixir, Erlang, Go, Kotlin and Racket parsers.

Display
 - Tweaked the colours on the file header, to make metadata less prominent.
 - Improved styling of file rename information.
 - Improved syntax hightling for Java built-in types.

Diffing
 - Fixed an issue with runaway memory usage when the two files input files
   had a large number of differences.

Build
 - Difftastic now requires Rust 1.59 to build.