Fix Complex AutoSerialization

[calder]

Before

➤ cargo nextest run --all-features
...
──── STDERR:             npyz serialize::primitive::tests::default_complex_type_strs
thread 'serialize::primitive::tests::default_complex_type_strs' panicked at src/type_str.rs:277:72:
called `Result::unwrap()` on an `Err` value: ParseTypeStrError(InvalidSize(TypeStr { endianness: Little, type_char: Complex, size: 4, time_units: None }))
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
...
     Summary [   0.041s] 61/106 tests run: 60 passed, 1 failed, 0 skipped
        FAIL [   0.024s] npyz serialize::primitive::tests::default_complex_type_strs

After

➤ cargo nextest run --all-features
...
     Summary [   0.143s] 106 tests run: 106 passed, 0 skipped

[ExpHP]

My goodness that's embarrassing! Thank you for fixing this. Hope the bug didn't cause you too much trouble! I can push a release tonight.

[ExpHP]

Wait holy moly this was a month ago? Ah, shoot. Sorry for the wait 😓