devel/got: update to 0.57

User-visible changes:

• make 'got send' actually heed branch {} options in got.conf(5) as intended
• tog: add support for navigating to first/last line of blame view
• fix bogus error when 'got cherrypick' merged changes into locally added file
• remove ancestry checks to make 'got cherrypick' and 'got backout' run faster
• limit checks for merge conflicts to files affected by the merge to be faster