multimedia/libaom: Update to 3.8.2

Changelog:
2024-03-08 v3.8.2
  This release includes several bug fixes. This release is ABI
  compatible with the last release. See
  https://aomedia.googlesource.com/aom/+log/v3.8.1..v3.8.2 for all the
  commits in this release.

  - Bug Fixes
    * aomedia:3523: SIGFPE in av1_twopass_postencode_update()
      pass2_strategy.c:4261.
    * aomedia:3535, b/317646516: Over reads in aom_convolve_copy_neon().
    * aomedia:3543: invalid feature modifier when compiling
      aom_dsp/arm/aom_convolve8_neon_i8mm.c on Debian 10 with arm64
      architecture.
    * aomedia:3545: Failed to parse configurations due to inconsistent
      elements between two arrays "av1_ctrl_args" and "av1_arg_ctrl_map"
      in aomenc.c.
    * oss-fuzz:66474, b/319140742: Integer-overflow in search_wiener.
    * Zero initialize an array in cdef search.

(ryoon)