[bug#42885] [PATCH 23/27] gnu: calibre: Update to 5.13.0.

[Brendan Tildesley]

Well, using a python-pyqt with the python-sip input set back to python-sip-4 
fixes it. Do we want to commit to getting it working with python-sip@5. I'm 
still playing around with it trying to get it to build

Not sure where you see that sip error. The builds fail for me with

make[2]: Leaving directory '/tmp/guix-build-qgis-3.16.3.drv-0/build'
make[2]: *** 
[python/CMakeFiles/python_module_qgis__core_autogen.dir/build.make:682: 
python/core/sip_corepart0.cpp] Error 1
make[2]: *** Deleting file 'python/core/sip_corepart0.cpp'
make[2]: Leaving directory '/tmp/guix-build-qgis-3.16.3.drv-0/build'
make[1]: *** [CMakeFiles/Makefile2:8003: 
python/CMakeFiles/python_module_qgis__core_autogen.dir/all] Error 2