CTAN update: l3kernel

[CTAN Announcements]

The LaTeX Team submitted an update to the

                l3kernel

package.

Version number: 2022-04-29
License type: lppl1.3c

Summary description: LaTeX3 programming conventions

Announcement text:
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## [2022-04-29]

### Added
- Language setting `el-xiota` for retention of ypogegrammeni when uppercasing
  Greek

### Changed
- Rename case-changing variant `de-alt` to `de-xeszett` to align with
  `luaotfload`
- Allow for `\lccode`/`\uccode` changes in `\char_...case:n` functions

### Fixed
- Support for ypogegrammeni in case changing Greek (see issue \#1088)


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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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