update FFmpeg to ensure compatibility with newer kernels

[MarcA711]

Proposed change

An update of the VPU driver in the current vendor kernel causes incompatibilities with the current FFmpeg version (see #16006 (comment)). This PR updates FFmpeg to fix this. The timing is bad because the new version wasn't tested in depth. However, I think it would still be good to ship v0.15 with the new version.

Two users want to test the new version. Once they confirm that everything works, I will request reviewing/ merging this PR.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code
• Documentation Update

Additional information

• This PR fixes or closes issue: [Support]: Lost birdview cameras #16006, General chat for Rockchip users #11502 (reply in thread)
• This PR is related to issue:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• The code has been formatted using Ruff (ruff format frigate)

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[MarcA711]

Both users confirmed that the updated FFmpeg works and fixes the problem. This PR can now be merged.

Many thanks @GMagician and @ragenhe for reporting the issue and and testing the fix.