package: fix typo in vendor sha

[johanot]

[cafkafk]

flake checks worked locally, lgtm

[johanot]

@cafkafk Thanks.

The CI never caught this typo, because the CI uses this package def: https://github.com/DBCDK/morph/blob/master/flake.nix#L79-L110

Should we remove one of those? :)

i.e. either remove default.nix or import default.nix from the flake.

[cafkafk]

i.e. either remove default.nix or import default.nix from the flake.

I think some people (e.g. srhb) likes the default.nix to be around so she can avoid touching flakes if nescesarry, so we should probably import that (well, or move the package definition from the flake.nix into default.nix since it has some additional attrs from a glance, like mainProgram).