Log Message:
py-qt-builder: update to 1.16.3.

v1.16.3

Link to the stable SIP documentation

The documentation now links to the stable version of the SIP
documentation.

Resolves #11

Missing multimedia libraries in Qt v6.7

In Qt v6.7 the QtMultimedia ffmpeg backends depend on new libraries
that were not included in the Qt wheels. This affected macOS (Qt
v6.7.1) and Windows (Qt v6.7.0).

Resolves #12

Added support for sub-wheels to pyqt-qt-wheel

The (undocumented) pyqt-qt-wheel utility now supports the splitting
of a project's wheel into the main wheel and a sub-wheel. Specifying
--sub-wheel generate will generate the sub-wheel, and --sub-wheel
exclude will generate the main wheel (ie. a normal wheel without
the contents of the sub-wheel). By default a normal wheel is
generated.