Merge tag 'efi-2023-07-rc1-2' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2023-07-rc1-2

Documentation:

* Describe Python coding style

UEFI:

* Enable tests for authenticated capsules on the sandbox
* Fix pylint warnings
* Correct struct efi_hii_keyboard_layout definition