west.yml: MCUboot synchronization from upstream

Update Zephyr fork of MCUboot to revision:
  11982df962e2314f4e0c73b7ebc17172026c9266

Brings following Zephyr relevant fixes:

  - 11982df9 boot: Switch to picolibc
  - ef7d68bf boot: zephyr: boards: delete mcxn947 configuration.
  - 47dc5086 boot: zephyr: update NXP MPU define to new name
  - 35536633 boot: bootutil: bootutil_misc: Fix max image size for
    single images
  - e8b22363 bootutil: Fix crash when bootutil_sha_init() is called
    in loop
  - 0eaf6668 boot: bootutil: Only update the security counter for
    confirmed images
  - 792d411d bootutil: encryption: Fix typo in PSA code
  - 2e605191 boot: bootutil: swap-offset: Fix image size check
    during validation
  - 61d280b9 boot: bootutil: Fix max image size computation for
    swap-move/swap-offset
  - 17b56a0a imgtool: fix verify tlv offset before main scan
  - 264f6ee9 boot/zephyr/main: fix placement of pointer to arm
    vector
  - c412cdfb bootutil: Improve HKDF code
  - 454cae8b bootutil: Remove BOOTUTIL_CRYPTO_AES_CTR_KEY_SIZE
  - 2367a607 bootutil: Improve defines in PSA encryption source
  - 3f458fea Bootutil: always initialise the size returned by
    boot_util_image_size()
  - 671513cb zephyr: nRF54l15_cpuapp configuration with LTO enabled

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>