You should remove kdsoap-qt5 as it is a package that is no longer in the repositories:
pamac search kdsoap
mingw-w64-kdsoap 2.1.1-1 AUR
Qt-based client-side and server-side SOAP component (mingw-w64)
kdsoap-qt6-git 2.2.1_r1966.gd56e5ce3-1 AUR
Qt-based client-side and server-side SOAP component
kdsoap-qt5-git 2.2.1_r1966.gd56e5ce3-1 AUR
Qt-based client-side and server-side SOAP component
kdsoap-ws-discovery-client 0.4.0-3 [Installed] extra
WS-Discovery client library based on KDSoap
kdsoap 2.3.0-1 [Installed] extra
Qt-based client-side and server-side SOAP component
The kdsoap package now provides kdsoap-qt6:
pamac info kdsoap | grep -Ei "name|version|provides|replaces"
Name : kdsoap
Version : 2.3.0-1
Provides : kdsoap-qt6
Replaces : kdsoap-qt6