Backport Qt fix for QTBUG-146665

[tytan652]

Description

In OBS Studio, this bug causes right-click to not work for disabled items in the source list. This is fixed on the Qt 6.11 branch and in 6.12.0-beta1.

Motivation and Context

Twin of obsproject/obs-deps#318:

Want to fix a UI regression in OBS Studio.

How Has This Been Tested?

This hasn't been tested yet, so any testing would be appreciated. Otherwise, if we have high confidence this will address the issue, we can just merge it and do a new deps release.

Testing in Flatpak built with CI tarballs shown that the issue is addressed.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have read the contributing document.
• My code has been run through clang-format.
• My code follows the project's style guidelines
• My code is not on the master branch.
• My code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.