Bump bindgen to 0.71 #375

Job	Run time
rustfmt_check (macos-latest)	15s
rustfmt_check (windows-latest)	33s
rustfmt_check (ubuntu-latest)	14s
rust_clippy_check_ubuntu	6m 33s
build_dynamic_and_test_macos	2m 3s
rust_clippy_check_windows	1m 30s
build_dynamic_and_test_ubuntu	2m 31s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows, true)	1m 35s
build_dynamic_and_test_windows_pre	2m 52s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static-md)	1m 35s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static, -Ctarget-feature=+cr...	1m 36s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows, true)	1m 34s
docs_rs_check	2m 22s
build_static_and_test_ubuntu_with_system_ffmpeg	1m 26s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static-md)	1m 38s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static, -Ctarget-feature=+crt-...	1m 38s
build_static_and_test_ubuntu	7m 1s
build_dynamic_and_test_windows	1m 51s
	38m 47s

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