Accessibility: title to wizard invisible in dark mode

Issue type

Accessibility issue (e.g. for keyboard-only or screen reader users)

Description with steps to reproduce

This program happens to users of at least Windows.

1. Turn into a high contrast theme, for example "Night Sky", at Settings > Accessibility > High Contrast Theme, or press Alt + Shift + Print Screen, if this shortcut is on or go to Control Panel > Make this computer easier to use, and turn it on.
2. Open an outdated MuseScore program able to update automatically.
3. Select to update it.

Then the wizard opens but its title and related content is invisible in the white banner, while it can be read by a screen reader, for example Narrator.
The problem has been reported at Muse Hub: https://musescore.org/en/comment/1263876#comment-1263876

Supporting files, videos and screenshots

What is the latest version of MuseScore Studio where this issue is present?

OS: Windows 10 Version 2009 or later, Arch.: x86_64, MuseScore version (64-bit): 4.2.1-240230937, revision: github-musescore-musescore-d757433

Regression

I was unable to check

Operating system

Windows 11 Version 23H2 (OS internal version 22631.4317)

Additional context

Change color contrast in Windows
https://support.microsoft.com/en-us/windows/change-color-contrast-in-windows-fedc744c-90ac-69df-aed5-c8a90125e696

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible