move SPI_FLASH_BACKUP to Conditionals-5 again#27936

thinkyhead merged 3 commits intoMarlinFirmware:bugfix-2.1.xMarlinFirmware/Marlin:bugfix-2.1.xfrom

ellensp:SPI_FLASH_BACKUP-update-againellensp/Marlin:SPI_FLASH_BACKUP-update-againCopy head branch name to clipboard