[QGIS-Developer] OSGeo4W, sip update 4.19.14

[Matthias Kuhn]

Hi

Recently sip 4.19.14 has been released, it fixes a critical issue with
our python bindings where geometries are converted to the wrong subclass
(see https://issues.qgis.org/issues/20661).

This leads to problems in custom (and core python based) processing
algorithms and probably other places too.

Would it be possible to upgrade sip to the latest version on OSGeo4W
(and any other builds where we ship sip ourselves)? If I can do
something to help, please let me know!

Best regards

Matthias