fix(avutil): correct FFmpeg version of ch_layout #406

Job	Run time
rust_clippy_check_ubuntu	8m 6s
rustfmt_check (windows-latest)	21s
rustfmt_check (macos-latest)	8s
rustfmt_check (ubuntu-latest)	7s
build_static_and_test_ubuntu_with_system_ffmpeg	2m 12s
build_static_and_test_ubuntu	8m 43s
build_dynamic_and_test_ubuntu	2m 33s
rust_clippy_check_windows	1m 23s
build_dynamic_and_test_windows_pre	3m 50s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static, -Ctarget-feature=+cr...	1m 33s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static-md)	1m 24s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows, true)	1m 15s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static, -Ctarget-feature=+crt-...	1m 35s
docs_rs_check	1m 41s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows, true)	1m 30s
build_dynamic_and_test_macos	3m 17s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static-md)	1m 35s
build_dynamic_and_test_windows	1m 42s
	42m 55s

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