CTAN update: l3kernel

[CTAN Announcements]

The LaTeX Project Team  submitted an update to the

                l3kernel

package.

Version number: 2023-12-08
License type: lppl1.3c

Summary description: LaTeX3 programming conventions

Announcement text:
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## [2023-12-08]

### Added
- `\c_empty_str` (issue \#1361)
- `l3bitset`: moved from `l3experimental`

### Fixed
- Return `str` (not `tl`) in `\bool_to_str:N` and `\bool_to_str:n` (issue \#1331)
- Catcode of space from `\str_set_convert:Nnnn` (issue \#1344)
- Tidy up various documentation issues (issue \#1345)


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This package is located at 
   https://mirrors.ctan.org/macros/latex/contrib/l3kernel

More information is at
   https://www.ctan.org/pkg/l3kernel

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   Thanks for the upload.

     For the CTAN Team
    Erik Braun

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