darwin crash

Fails on macOS 15.2 nixpkgs-unstable with backtrace ``` bsh ❯ nix-du Reading dependency graph from store... thread 'main' panicked at src/depgraph.rs:297:13: Unknown store path type: {libproc/1793/region} stack backtrace: 0: 0x102b831e8 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hdb9deda2087c2300 1: 0x102bb49b4 - core::fmt::write::h763d65a105e4dd04 2: 0x102b7721c - std::io::Write::write_fmt::h1b049e2a823744e1 3: 0x102b8309c - std::sys::backtrace::BacktraceLock::print::h8201c7617f7c437c 4: 0x102b86ed8 - std::panicking::default_hook::{{closure}}::hebeb0bf371e8970e 5: 0x102b86d14 - std::panicking::default_hook::h52d205c8d46f678c 6: 0x102b874dc - std::panicking::rust_panic_with_hook::hf71161e8fa215972 7: 0x102b837b8 - std::panicking::begin_panic_handler::{{closure}}::h8f0d9004a83b0d21 8: 0x102b83440 - std::sys::backtrace::__rust_end_short_backtrace::h530111f59c896cd9 9: 0x102b86f68 - _rust_begin_unwind 10: 0x102bc224c - core::panicking::panic_fmt::h43c21d3ca19f8fab 11: 0x102a574bc - _register_node 12: 0x102a6eb6c - __ZNSt3__110__function6__funcIZ13populateGraphE3$_0NS_9allocatorIS2_EEFvvEEclEv 13: 0x102df6000 - __ZN3nix16handleExceptionsERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEENS0_8functionIFvvEEE 14: 0x102a6e2f8 - _populateGraph 15: 0x102a57604 - nix_du::depgraph::DepInfos::read_from_store::h2e6342890a88eb39 16: 0x102a63c40 - nix_du::main::h77f2936b3edab38a 17: 0x102a6d6ac - std::sys::backtrace::__rust_begin_short_backtrace::h5d3d552b0b2ed301 18: 0x102a6c25c - std::rt::lang_start::{{closure}}::h2c683f28dd45d2f8 19: 0x102b846fc - std::rt::lang_start_internal::h60914846c59a19a9 20: 0x102a65e68 - _main Abort trap: 6 ```