/usr/share/php/GuzzleHttp/Stream/ is in php-guzzle-stream 3.0.0-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/GuzzleHttp/Stream/AppendStream.php
/usr/share/php/GuzzleHttp/Stream/AsyncReadStream.php
/usr/share/php/GuzzleHttp/Stream/BufferStream.php
/usr/share/php/GuzzleHttp/Stream/CachingStream.php
/usr/share/php/GuzzleHttp/Stream/DroppingStream.php
/usr/share/php/GuzzleHttp/Stream/Exception/
/usr/share/php/GuzzleHttp/Stream/Exception/CannotAttachException.php
/usr/share/php/GuzzleHttp/Stream/Exception/SeekException.php
/usr/share/php/GuzzleHttp/Stream/FnStream.php
/usr/share/php/GuzzleHttp/Stream/GuzzleStreamWrapper.php
/usr/share/php/GuzzleHttp/Stream/InflateStream.php
/usr/share/php/GuzzleHttp/Stream/LazyOpenStream.php
/usr/share/php/GuzzleHttp/Stream/LimitStream.php
/usr/share/php/GuzzleHttp/Stream/MetadataStreamInterface.php
/usr/share/php/GuzzleHttp/Stream/NoSeekStream.php
/usr/share/php/GuzzleHttp/Stream/NullStream.php
/usr/share/php/GuzzleHttp/Stream/PumpStream.php
/usr/share/php/GuzzleHttp/Stream/Stream.php
/usr/share/php/GuzzleHttp/Stream/StreamDecoratorTrait.php
/usr/share/php/GuzzleHttp/Stream/StreamInterface.php
/usr/share/php/GuzzleHttp/Stream/Utils.php
/usr/share/php/GuzzleHttp/Stream/autoload.php