iwyu.yml: use Qt 6.7.0 for include-what-you-use

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Starting with Qt 6.7.0 we no longer require the Qt mappings because IWYU annotations have been added to the headers upstream (see https://bugreports.qt.io/browse/QTBUG-119505).

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jurplel/install-qt-action does not seem to work with OpenSUSE

Error: Error: Unable to locate executable file: apt-get. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also check the file mode to verify the file is executable.

I filed jurplel/install-qt-action#232 upstream.

Also somehow installing Qt 6.7.0 doesn't work:

/opt/hostedtoolcache/Python/3.11.8/x64/bin/python3 -m aqt install-qt linux desktop 6.7.0 --outputdir /home/runner/work/cppcheck/Qt --modules qtcharts
INFO    : aqtinstall(aqt) v3.1.12 on Python 3.11.8 [CPython GCC 11.4.0]
ERROR   : The packages ['qt_base', 'qtcharts'] were not found while parsing XML of package information!
==============================Suggested follow-up:==============================
* Please use 'aqt list-qt linux desktop --arch 6.7.0' to show architectures available.
* Please use 'aqt list-qt linux desktop --modules 6.7.0 <arch>' to show modules available.
Error: Error: The process '/opt/hostedtoolcache/Python/3.11.8/x64/bin/python3' failed with exit code 1

I filed jurplel/install-qt-action#231 upstream.

[firewave]

jurplel/install-qt-action does not seem to work with OpenSUSE

This is only about installing the dependencies which we do not even need since we only require the headers.

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The 6.7.0 install issue is fixed upstream.

Fedora Rawhide is already on 6.7.0 so we could switch to that to get rid of the Qt mappings but unfortunately they are still at a later include-what-you-use version...

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ArchLinux has Qt 6.7.0 and IWYU 0.21 but somehow lupdate is broken on it...

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Successful runs with the changes applied:
https://github.com/danmar/cppcheck/actions/runs/8694613994/job/23843900061
https://github.com/danmar/cppcheck/actions/runs/8694613994/job/23843899803

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Somehow it does not pick up the IWYU pragmas from the Qt headers and still suggests the wrong headers. This was definitely working while I tested these changes.

[firewave]

Somehow it does not pick up the IWYU pragmas from the Qt headers and still suggests the wrong headers. This was definitely working while I tested these changes.

There are actually being used there are just lots of shortcomings.