Cherry-pick most of "Qt: Fix -Werror=deprecated-declarations when using Qt > 6.7" #25687
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(cherry picked from commit 07400b515c3d8d03bf3d6e35c26ec8a3d7317560; amended to omit change to code added in LadybirdBrowser/ladybird#1497 since we don't have that yet)
LadybirdBrowser/ladybird#1807