qrcodegen is built on obs-deps for macOS and Windows, with the
generated CMake package calling the dependency qrcodegen (not
libqrcoden) and associated target qrcodegen::qrcodegen.
This change updates the finder (required for Linux) to create the same
targets so consumers do not need to differentiate between different
variations of the same dependency on Linux.
Also updates obs-websocket to 5.3.1 to bring in associated CMake
changes.
