graphics/qgis-ltr: Update to 3.44.13
In preparation for a major release upgrade from 3.x to 4.x in
graphics/qgis, move the current version 3.44 from graphics/qgis
to graphics/qgis-ltr.
- Switch from Qt5 to Qt6
- Use PDF4QT for better rendering in PDF
- Resolve FreeBSD-specific issues when using the QGIS-internal versions of spatialindex and lazperf
Changelog: From 3.40.15 to 3.44.13
https://github.com/qgis/QGIS/compare/final-3_40_15%5E...final-3_44_13