west.yaml: MCUboot synchronization from upstream

Update Zephyr fork of MCUboot to revision:
 143485e35b8da7d234677d8920a28f5ea03f6d09

Brings following Zephyr relevant fixes:
 143485e3 zephyr: Add missing Kconfig dependencies for USB DFU
 16f3de56 imgtool: fix boot_magic when -e big and max-align > 8
 259d989f bootutil: Fix erase of trailer when located in scratch area
 e8294b2a boot_serial: Add packed to struct
 68dcc0ee zephyr: single_loader: Switch to flash_area_get_sector
 069aea48 zephry: Add flash_area_get_sector
 9551b6ef boot: zephyr: Remove deprecated GPIO Kconfig entries
 dc8ef879 zephyr: serial_recovery: Use Zephyr manifest zcbor files
 e026c367 imgtool: sign: allow using 16-bit custom TLVs from valid range

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>