PyQGIS Developer Cookbook (>=3.38): the QgsField constructor used in the examples is deprecated

[agiudiceandrea]

Description

In various examples, a deprecated QgsField constructor (using QVariant) is used. The examples should be updated to used the non deprecated QgsField constructor (using QMetaType), instead.
Probably other constructors / functions should be updated to use QMetaType.

See qgis/QGIS#57272.

Page URL:
e.g. https://docs.qgis.org/3.34/en/docs/pyqgis_developer_cookbook/vector.html#creating-vector-layers

[DelazJ]

@agiudiceandrea isn't this already fixed: b8fd0fb? Afaict this wasn't backported so 3.34 docs is not a relevant target here.

[agiudiceandrea]

@DelazJ you are right. I was comparing the two versions and I got confused between the two... In 3.34 Qvariant.type is not deprecated.