devel/got: update to 0.127

User-visible changes:

• make 'got merge' accept tags as merge source argument
• do not raise errors when unversioned files are found during got rm -k
• add rm -s ? option for deleting unversioned files from the work tree
• add rm -I option for also deleting ignored unversioned files with rm -s ?
• make 'tog log' reload the work tree's base-commit info during Ctrl-L refresh
• fix failures due to trailing slashes in checkout -p path-prefix argument