Switch to Qt 6.7.3 for macOS and Windows #1065

Description

Qt 6.7.3 was released on September 27, 2024.

• Release Note: https://code.qt.io/cgit/qt/qtreleasenotes.git/about/qt/6.7.3/release-note.md
• Archive: https://download.qt.io/archive/qt/6.7/6.7.3/submodules/qtbase-everywhere-src-6.7.3.tar.xz
• Archive Info: https://download.qt.io/archive/qt/6.7/6.7.3/submodules/qtbase-everywhere-src-6.7.3.tar.xz.mirrorlist
• Size: 49426156
• SHA256: 8ccbb9ab055205ac76632c9eeddd1ed6fc66936fc56afc2ed0fd5d9e23da3097

Previous version bump

• Switch to Qt 6.7.2 for macOS and Windows #963

Version or commit-id

dd7b112

Environment

• OS: macOS, Windows