Nix-update is using old version to calculate source hash

[Antares0982]

I'm using nix-update in my project to update hash, but recently I found that nix-update is using the old version to calculate new hash. It took a long time to determine that the issue originated in nix-update, because each test build in the workflow succeeded even though the source hash was completely incorrect.

I've created a new branch dev to reproduce this: dev, at 9b187e. Use nix run github:Mic92/nix-update -- --flake geosite to update the geosite hash.

when updating geosite from 202601202217 to 202601232213, the expected hash for version 202601232213 is

sha256-VwV0jJsr+jMk5NFzct3AFP/IHO2x1ZomTVHSaWIeg7s=

while hash for 202601202217 is

sha256-0CzZ0FxdRivoIbwGfWwPsXPyCDzvBmQq0hrHxyeZ1N0=

and that is what nix-update gives. (BTW the sha256-gGOPZn+hOsUSOSSFxTLbrPyUQO9m7j5La2mF7RtXoAg= in this commit is the hash of previous version 202601192216)

After git bisect I found that 822751 in nix-update is the first bad commit. You can verify this by running test.sh in my repo.