invalid data in index - calculated checksum does not match expected; class=Index (10)

[tgeng]

I am using git 2.43 and have seen this error when creating a PR

> spr diff -m update --cherry-pick --update-message
  🛑  invalid data in index - calculated checksum does not match expected; class=Index (10)

I assume it's related to https://github.com/libgit2/libgit2/pull/6738 and it looks like upgrading libgit2 to 1.8.0 should fix the problem.