Evaluation caching doesn't work for git+ssh scheme inputs

[thenonameguy]

Describe the bug
git+ssh scheme devenv.yaml inputs do not get updated after devenv update $the-input, when using direnv automatic shell activation.

To reproduce

Full repro case TBD, but here is the gist of it.

inputs:
  backend:
    url: git+ssh://git@github.com/some-private/devenv-git-repo?ref=feat/redacted
    flake: false

  enterShell = "ln -sf ${inputs.backend} ./backend";

After running devenv update backend, I would expect the symlink to be updated, but it doesn't.

Calling shell --refresh-eval-cache fixes the issue, while hinting at the problem:

❯ devenv shell --refresh-eval-cache
• Building shell ...
warning: could not update mtime for file '/Users/kszabo/.cache/nix/gitv3/00ndysgdshg9raghh2b530ydhl9x68xr15vkiyabdfa7lc77h4ja-shallow/refs/heads/feat/redacted': error:
       error: changing modification time of '"/Users/kszabo/.cache/nix/gitv3/00ndysgdshg9raghh2b530ydhl9x68xr15vkiyabdfa7lc77h4ja-shallow/refs/heads/feat/redacted"': No such file or directory

Version

devenv 1.3.1 (aarch64-darwin)