Update for Qt6

[douglasheld2]

Support is ended for Qt5 and Qt releases are now on 6.7.2. SavvyCAN is building for this version of Qt. (Reference: collin80/SavvyCAN#804 )

[evermind-zz]

you could try my port to qt6 it compiles on linux. But I cant test it. See #6

[douglasheld2]

I apologise, I thought I created a pull request. Instead I'd forked the project and built for Qt6 here: https://github.com/douglasheld2/clx000-qt6-plugin
I emailed the author but I did not create the pull request.

I do not have my Linux computer ready to use. Hopefully someone else will be able to test.

[evermind-zz]

No problem it did not take too long :)