build(deps): update to FFmpeg 7.1

[cgutman]

Description

Integrate the FFmpeg update from LizardByte/build-deps#359 along with the Sunshine changes required to support them.

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 9.74%. Comparing base (756d2e1) to head (7e0e58b).
Report is 89 commits behind head on master.

Files with missing lines	Patch %	Lines
src/video.cpp	0.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3263      +/-   ##
=========================================
- Coverage    9.74%   9.74%   -0.01%     
=========================================
  Files         101     101              
  Lines       17972   17975       +3     
  Branches     8417    8420       +3     
=========================================
  Hits         1751    1751              
  Misses      13330   13330              
- Partials     2891    2894       +3     

Flag	Coverage Δ
Linux	7.27% <ø> (ø)
Windows	5.10% <ø> (ø)
macOS-13	10.53% <0.00%> (-0.02%)	⬇️
macOS-14	10.02% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/video.cpp	27.17% <0.00%> (-0.07%)	⬇️

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
20.0% Duplication on New Code

See analysis details on SonarCloud