Bump version to `0.16.3` #379

Job	Run time
rust_clippy_check_windows	19m 55s
rustfmt_check (macos-latest)	8s
rust_clippy_check_ubuntu	6m 14s
rustfmt_check (windows-latest)	21s
rustfmt_check (ubuntu-latest)	5s
docs_rs_check	1m 10s
build_static_and_test_ubuntu_with_system_ffmpeg	1m 42s
build_dynamic_and_test_ubuntu	2m 30s
build_static_and_test_ubuntu	6m 39s
build_dynamic_and_test_macos	1m 53s
build_dynamic_and_test_windows_pre	2m 57s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static-md)	19m 9s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows, true)	20m 41s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static-md)	19m 15s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static, -Ctarget-feature=+cr...	19m 48s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows, true)	19m 36s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static, -Ctarget-feature=+crt-...	19m 9s
build_dynamic_and_test_windows	1m 14s
	2h 42m 26s

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