nix hashing format fix

[h0nIg]

hashing format sha256:sha256:0ysps2384nzrjrbl9f6gcwmq1fmcb2jp3vcxkvmv9wiasvmy893z causes errors

  File "/nix/store/cdaifv92znxy5ai4sawricjl0p5b9sgf-python3-3.13.11/lib/python3.13/subprocess.py", line 577, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['nix', '--extra-experimental-features', 'nix-command', 'hash', 'to-sri', 'sha256:sha256:0ysps2384nzrjrbl9f6gcwmq1fmcb2jp3vcxkvmv9wiasvmy893z']' returned non-zero exit status 1.

[SuperSandro2000]

Not sure why the CI fails

[figsoda]

Not sure why the CI fails

#536 should fix this, seems unrelated

[figsoda]

ideally we should still probably convert the hash to sri, but this is fine for now