contrib: aom: update to 3.9.1

2024-06-05 v3.9.1 This release includes several bug fixes. This release is ABI compatible with the last release. See https://aomedia.googlesource.com/aom/+log/v3.9.0..v3.9.1 for all the commits in this release.

• Bug Fixes
  • aomedia:2754, aomedia:3567: Ensure thread stack size is at least 256 KB
  • b:330639949, oss-fuzz:68195: Increase scaling in linsolve_wiener
  • Fix high target data rate overflow.
  • aomedia:3509: Fix two UBSan errors in av1_rc_update_framerate()
  • 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:3571: {,highbd_}intrapred_neon.c: Avoid over-reads in z1 and z3 preds
  • aomedia:3578: libaom-3.9.0 undefined reference to `aom_sub_pixel_variance16xh_ssse3'
  • aomedia:3579: Use round for RC calculations in cyclic_refresh
  • aomedia:3580: Allow g_timebase.num to be greater than g_timebase.den
  • oss-fuzz:68774: libaom:av1_dec_fuzzer: Segv on unknown address in od_ec_dec_init
  • Arm SVE build fixes.
  • av1_block_error_lp_neon: fix block_size param type
  • av1_block_error_lp_sve: fix block_size param type