fix CI failure (#59)

this failure: https://github.com/unicode-rs/unicode-width/actions/runs/9369551827/job/25794342788
`src/tables.rs: needs update`
due to a change made in PR #54

scripts/unicode.py

@@ -585,6 +585,8 @@ def emit_module(
         module.write(
             """
 pub mod charwidth {
+    use core::convert::TryFrom;
+
     /// Returns the [UAX #11](https://www.unicode.org/reports/tr11/) based width of `c` by
     /// consulting a multi-level lookup table.
     /// If `is_cjk == true`, ambiguous width characters are treated as double width; otherwise,