CTAN update: l3build

[CTAN Announcements]

The LaTeX Project Team submitted an update to the

                l3build

package.

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

Summary description: A testing and building system for (La)TeX

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

### Changed
- Document default value of `ctanpkg` as a valid lua expression
- Improve log for failed checks with no diff files
- Document full syntaxes of `\SHOWFILE` and `\ASSERT(STR)`

### Fixed
- Short-circuit `check --rerun` if `testdir` doesn't exist
- Retain errorlevel on Windows during `check` target


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This package is located at 
   https://mirrors.ctan.org/macros/latex/contrib/l3build

More information is at
   https://www.ctan.org/pkg/l3build

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   Thanks for the upload.

     For the CTAN Team
    Erik Braun

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