chore: Update FluidAudio to v0.7.8

Update FluidAudio from v0.7.7 (2dd0bd1) to v0.7.8 (8136bd0)

Performance improvements:
- 5% faster ASR inference
- 10% fewer missing words on long audio files
- 0.5% improved WER for v2 and v3 models

Stability improvements:
- Fixed ANE concurrency crashes (<3% latency impact)
- Switched ASR to stateless for better batching support
- Improved concurrency safety

This is a backward-compatible update with no API breaking changes.
No code changes required - all existing Parakeet integration works as-is.

Full changelog: https://github.com/FluidInference/FluidAudio/compare/v0.7.7...v0.7.8

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

VoiceInk.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -16,7 +16,7 @@
       "location" : "https://github.com/FluidInference/FluidAudio",
       "state" : {
         "branch" : "main",
-        "revision" : "2dd0bd1849147f772167bc2f28535e614ca6dd53"
+        "revision" : "8136bd0642e7c5ce1f6f5b2931890266aeecb08c"
       }
     },
     {