build(deps): bump third-party/FFmpeg/SVT-AV1 from b33dcc5 to 15042e5

Bumps [third-party/FFmpeg/SVT-AV1](https://github.com/LizardByte-infrastructure/SVT-AV1) from `b33dcc5` to `15042e5`.
- [Commits](LizardByte-infrastructure/SVT-AV1@b33dcc5...15042e5)

---
updated-dependencies:
- dependency-name: third-party/FFmpeg/SVT-AV1
  dependency-version: 15042e5a0710d0a84fa693273ddd4ec40eb6dec4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]