Log Message:
devel/difftastic: update to 0.49.0

0.49 (release 26th July 2023)
Parsing
 - Added support for LaTeX.
 - Updated grammars for C, C++ and Java.
 - Improved parsing of qualified constructors in Haskell.
 - Difftastic is now stricter about valid UTF-8 and UTF-16, considering more
   of the file's bytes during filetype detection. This fixes cases where e.g.
   PDF was sometimes incorrectly considered as UTF-8.

Diffing
 - Improved handling of delimiters ("nested sliders") in languages \ 
that prefer
   the outer delimiter, such as JSON and Lisps.

Build
 - Difftastic now requires Rust 1.58 to build.