Cargo 1.51があるrevisionはある
https://lazamar.co.uk/nix-versions/?package=cargo&version=1.51.0&fullName=cargo-1.51.0&keyName=cargo&revision=a78ed5cbdd5427c30ca02a47ce6cccc9b7d17de4&channel=nixpkgs-unstable#instructions
override-inputして
https://discourse.nixos.org/t/update-flake-input-to-specific-revision/8952
❯ nix develop
error: evaluation aborted with the following error message: 'The nixpkgs-lib dependency of flake-parts was overridden but is too old.
The minimum supported version of nixpkgs-lib is 22.05,
but the actual version is 21.05pre-git (nixpkgs-lib.rev: a78ed5cbdd5427c30ca02a47ce6cccc9b7d17de4).
'
今度、削ってみるかね