Release Notes for v42.3.1

Fixes

• Fixed a desktopCapturer crash when sharing a window on Windows. #51787

Other Changes

• Enabled ThinLTO on macOS builds. #51823 ^{(Also in 43)}
• Improved performance of Linux and Windows release builds by enabling ThinLTO link-time optimization for the main Electron binary. #51821 ^{(Also in 43)}
• Improved performance of app.isDefaultProtocolClient() and app.setAsDefaultProtocolClient() on Linux. #51627
• Improved runtime performance. #51828
• Updated Chromium to 148.0.7778.218. #51790