libaom v3.8.3 release candidate 2

[Wan-Teh Chang]

Hi everyone,

libaom v3.8.3 release candidate 2 is available. The release tag is
v3.8.3-rc2. Your testing will be greatly appreciated.

This release includes several bug fixes. This release is ABI
compatible with the last release. See
https://aomedia.googlesource.com/aom/+log/v3.8.2..v3.8.3-rc2 for all the
commits in this release.

- Bug Fixes
* aomedia:2754, aomedia:3567: Ensure thread stack size is at least
256 KB
* aomedia:3382, chromium:339877165: update codec config after
svc/scale controls (CVE-2024-5493)
* aomedia:3561: libaom-3.8.2 armv7 Android build failed
* aomedia:3580: Allow g_timebase.num to be greater than
g_timebase.den
* Arm SVE build fixes.
* av1_block_error_lp_neon: fix block_size param type

Thanks,
Wan-Teh Chang