CLSA-2026-1784712935 thunderbird: Fix of 3 CVEs

CVE-2024-3854: fix Ion IsDiamondPattern successor-count guard allowing switch terminators Mozilla bug 1884552 - CVE-2024-5702: fix use-after-free in nsTransportEventSinkProxy via raw-pointer to smart-pointer refactor Mozilla bug 1193389 - CVE-2026-0880: fix integer overflow in Cairo DrawTarget...