Log Message:
brlaser: new upstream, update to 6.2.6. Changes:

6.2.6:

New printer entries:
- Brother FAX-2840
- Brother HL-2260
- Brother HL-L2335D series
- Brother MFC-7860DW
- Brother MFC-9160

Notes:
* The repository has been cleaned up
  * All entries `brlaser.drv.in` and `README.md` both follow a set
    naming convention
  * Commits where "rewritten correctly" to follow the standard
    conventions and then squashed

6.2.5:

New printer entries:
- Brother FAX-2820
- Brother DCP-1610W

Code Changes:
- Added `\033&l1S` for duplex no tumble printing, as well as logic print
  duplex with and without tumble.
- Explicitly include `cstdint` in `test/tempfile.h`, so `uint8_t` is
  correctly defined.

Issues Resolved:
- Fixed building under Fedora 38; `error: 'uint8_t' was not declared in
  this scope`.