tig: update to 2.5.8.

tig-2.5.8
---------

Improvements:

- Update utf8proc to v2.8.0, supporting Unicode 15.
- Support editing from the pager and the log (-p) views. (#1243)
- Adjust build for native Apple Silicon.
- Autoscroll the pager view while loading. (#1223)
- Automatically show next diff in the status view. (#413, #469)
- Replace `Unknown` author with `Not Committed Yet`.
- Allow use of regular expressions for coloring. (#1249)
- Add support for option word-diff-regex. (#1252)
- Include original blob name in temporary filename. (#1254)

Bug fixes:

- Use %(file_old) for old filename in the blame view. (#1226)
- Correctly report which version of libncurses was linked. (#1240, #1241)
- Fix stage view closing when holding the ] key. (#1245)
- Make tests work from a path with symlinks.
- Fix encoding of very long lines. (#1227)
- Fix diffstat color for tig log -p.
- Clean IO before closing a view or quitting.

(fcambus)