tests: update now that merge.graft() doesn't set two equal parents
This is a consequence of https://phab.mercurial-scm.org/D7549.
CORE-TEST-OUTPUT-UPDATE: TODO
This instance will be upgraded to Heptapod 17.3.0rc1 on 2024-09-20 between 16:00 and 17:00 UTC+2
This is a consequence of https://phab.mercurial-scm.org/D7549.
CORE-TEST-OUTPUT-UPDATE: TODO