CTAN update: l3kernel

[CTAN Announcements]

The LaTeX Team submitted an update to the

                l3kernel

package.

Version number: 2022-01-12
License type: lppl1.3c

Summary description: LaTeX3 programming conventions

Announcement text:
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## [2022-01-12]

### Added
- Support for validity scope for keys
- `\peek_remove_filler:n`
- `\prop_to_keyval:N`
- `\regex_match_case:nn(TF)`, `\regex_replace_case_once:nN(TF)`,
  `\regex_replace_case_all:nN(TF)`

### Changed
- Policy change: functions will no longer be removed after deprecation,
  thus the Lua functions noted below are the *last* 'stable' code to be
  removed from `l3kernel` after deprecation
- Allow indirect conversions between colorspaces through fallback models
- Move some color functions from `l3backend`

### Deprecated
- `\peek_..._ignore_spaces:N(TF)` functions
- `\sys_load_deprecation:`
- Option `undo-recent-deprecations`

### Removed
- Lua functions in `l3kernel` table


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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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