Un-pin `ctrlc` dependency

Originally pinned in X2MMGGXQEXJQ, which seems to avoid an old version of the nix crate that contained a CVE. Since v3.4 uses a newer version of nix, this should no longer be an issue.

Created by  finchie  on May 16, 2025
ZNISCFZZKSQXS2P6RCPHS3MPT7SZB7G7XDYDJRADFGJYMDQ7CZUAC
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