Release Notes for v43.7.8

Fixes

• Fixed a crash on launch on macOS when the system refused to register the app for sleep/wake notifications. #54597
• Fixed webview.findInPage() hanging when the host page also has an iframe. #54584 ^{(Also in 44, 45)}
• Updated time zone data to tzdata 2026d, including British Columbia's move to permanent UTC-7. #54622