Log Message:
tex-l3kernel{,-doc}: update to 2023.67294

## [2023-04-19]

 ### Added
 - `\box_set_clipped:N` and variants (renamed from `\box_clip:N`)
 - `\text_declare_lowercase_mapping:nn(n)`,
    `\text_declare_titlecase_mapping:nn(n)`
    and `\text_declare_uppercase_mapping:nn(n)` to allow customization
    of case changing outcomes

 ### Changed
 - `\box_set_trim:Nnnnn` and `\box_set_viewport:Nnnnn` moved to
   stable kernel

 ### Fixed
 - Incorrect internal name in `\pdf_pagesize_gset:nn`

 ### Removed
 - Experimental `\box_clip:N` and variants (renamed to
   `\box_set_clipped:N`)

 ## [2023-04-20]

 ### Changed
 - Re-order arguments of `\text_declare_lowercase_mapping:nnn`,
   `\text_declare_titlecase_mapping:nnn` and
   `\text_declare_uppercase_mapping:nnn`

## [2023-06-05]

### Added
- `\cctab_gsave_current:N`, `\g_tmpa_cctab` and `\g_tmpb_cctab`
- `\prg_gset_eq_conditional:NNn`
- `\iow_shell_open:Nn`

## Deprecated
- `\tl_case:Nn(TF)`
- `expl3` package option `enable-debug` (no longer required)

### Fixed
- Set `\l_keys_value_tl` in `.initial:n`
- Support for boolean values in `expl3` package options
  `check-declarations` and `log-functions`
- Allow for optional `/` at end of `\input at path` entries