Bump version to `0.16.1+ffmpeg.7.0` #357

Job	Run time
build_static_and_test_ubuntu_with_system_ffmpeg	1m 3s
rust_clippy_check_ubuntu	5m 27s
build_dynamic_and_test_ubuntu	1m 38s
build_static_and_test_ubuntu	6m 2s
build_dynamic_and_test_macos	1m 43s
build_dynamic_and_test_windows_pre	2m 18s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static, -Ctarget-feature=+cr...	1m 37s
docs_rs_check	1m 20s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static-md)	1m 19s
rust_clippy_check_windows	1m 15s
rustfmt_check (macos-latest)	6s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows, true)	1m 30s
rustfmt_check (windows-latest)	20s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static, -Ctarget-feature=+crt-...	2m 3s
rustfmt_check (ubuntu-latest)	4s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static-md)	1m 35s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows, true)	1m 35s
build_dynamic_and_test_windows	1m 40s
	32m 35s

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