update icewind/streams to 0.4.0 and icewind/smb to 1.0.7 in files_external

apps/files_external/3rdparty/.gitignore

apps/files_external/3rdparty/composer.json

apps/files_external/3rdparty/composer.lock

apps/files_external/3rdparty/composer/ClassLoader.php

apps/files_external/3rdparty/composer/autoload_classmap.php

apps/files_external/3rdparty/composer/autoload_real.php

apps/files_external/3rdparty/composer/installed.json

apps/files_external/3rdparty/icewind/smb/README.md

apps/files_external/3rdparty/icewind/smb/composer.json

.../files_external/3rdparty/icewind/smb/src/NativeStream.php

apps/files_external/3rdparty/icewind/streams/.travis.yml

apps/files_external/3rdparty/icewind/streams/LICENCE

apps/files_external/3rdparty/icewind/streams/README.md

apps/files_external/3rdparty/icewind/streams/composer.json

...external/3rdparty/icewind/streams/src/CallbackWrapper.php

...external/3rdparty/icewind/streams/src/DirectoryFilter.php

...xternal/3rdparty/icewind/streams/src/DirectoryWrapper.php

apps/files_external/3rdparty/icewind/streams/src/File.php

...ternal/3rdparty/icewind/streams/src/IteratorDirectory.php

...les_external/3rdparty/icewind/streams/src/NullWrapper.php