Log Message:
Libaom: Update to 3.8.1

CHangelog:
2024-01-17 v3.8.1
  This release includes several bug fixes. This release is ABI
  compatible with the last release. See
  https://aomedia.googlesource.com/aom/+log/v3.8.0..v3.8.1 for all the
  commits in this release.

  - Bug Fixes
    * aomedia:3520: get_cubic_kernel_dbl: Assertion `0 <= x && x < 1'
      failed.
    * aomedia:3526: alloc_compressor_data() is called during every
      aom_codec_control() call on the encoder.
    * aomedia:3527: aom/av1/encoder/mcomp.c:1810: av1_full_pixel_search:
      Assertion `ms_params->ms_buffers.ref->width ==
      ms_params->ms_buffers.src->width' failed.
    * aomedia:3534: libaom encoder crashed by AOM_USAGE_ALL_INTRA and
      AOM_EFLAG_NO_REF_LAST flags.
    * b/310455204: Recreate workers if necessary.
    * b/310548198: Update frame size in actual encoding.
    * b/314858909: Do not use adaptive error estimate.
    * Fix a hang of cmake on arm64 macOS with cmake 3.27.0 or later.