CTAN update: l3build

[CTAN Announcements]

The LaTeX Team submitted an update to the

                l3build

package.

Version number: 2021-12-09
License type: lppl1.3c

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

Announcement text:
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## [2021-12-09]

### Added
- Support for pre-constructed TDS-style sources (variable `tdsdirs`)
- Support for injection of tokens using `specialformats`

### Changed
- If multiple configurations are present, let `l3build clean` run
  on all of them by default. (issue #214)


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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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