Bump third_party/libcamera-apps from `6202c09` to `c8351a0`

Bumps third_party/libcamera-apps from 6202c09 to c8351a0.

Commits

• c8351a0 build: Use 'feature' type for all meson options.
• 42fca03 postprocessor: Add Yuv420ToRgb override passing a destination pointer
• 4616aa5 options: Add custom postprocessing lib path option
• 2d72ea5 postprocessing: More robust factory handling for postproc stages
• 56604de postprocessing: Split existing postproc stages into loadable so files
• ec5e948 core: Allow dynamic loading of postprocessing stages
• 4fecfff core: Remove unused variable
• 414a738 build: Update release version to v1.4.4
• deb38c1 dng: Update libcamera format strings for PISP formats
• 70894c0 core: Use CompletedRequestPtr in the FrameInfo constructor
• Additional commits viewable in compare view