Bump version to `0.16.0+ffmpeg.7.0` #352

Job	Run time
rust_clippy_check_windows	1m 41s
build_static_and_test_ubuntu_with_system_ffmpeg	59s
build_dynamic_and_test_ubuntu	1m 45s
build_dynamic_and_test_macos	1m 40s
build_dynamic_and_test_windows_pre	2m 16s
build_static_and_test_ubuntu	5m 50s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static, -Ctarget-feature=+cr...	1m 29s
docs_rs_check	1m 6s
rust_clippy_check_ubuntu	5m 41s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static-md)	1m 34s
rustfmt_check (macos-latest)	7s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows, true)	1m 19s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static, -Ctarget-feature=+crt-...	1m 42s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static-md)	2m 6s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows, true)	1m 59s
rustfmt_check (windows-latest)	18s
rustfmt_check (ubuntu-latest)	3s
build_dynamic_and_test_windows	1m 55s
	33m 30s

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