devel/freebsd-git-devtools: Update to 2024-04-22 snapshot, 76a8625bc7

Base commits since last update:

76a8625bc71d - mfc-candidates: use stable/14 as default MFC-to branch
793745fad866 - mfc-candidates: move pretty printing into lua
d51c59002367 - mfc-candidates: fix output order with incorrect commit dates
3f115b864b1f - git/mfc-candidates.sh: allow comments in exclude file
280085ef0c9d - tools/git: ensure git-arc is more platform indepdendent
e1735b35e3e4 - git-arc: Retain color status messages
787cb30d20ac - git-arc: Add -c flag to patch to commit the change
9f48ef1fcae5 - git-arc: Cope with extra output
df834e06bbc7 - git-arc: Just strip escape sequences form arc log

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