Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues: Update to Mozilla Thunderbird 140.3 (bsc#1249391). Security issues fixed: - MFSA 2025-78 * CVE-2025-10527: sandbox escape due to use-after-free in the Graphics: Canvas2D component. * CVE-2025-10528: sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. * CVE-2025-10529: same-origin policy bypass in the Layout component. * CVE-2025-10532: incorrect boundary conditions in the JavaScript: GC component. * CVE-2025-10533: integer overflow in the SVG component. * CVE-2025-10536: information disclosure in the Networking: Cache component. * CVE-2025-10537: memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143. Other issues fixed: - Right-clicking 'List-ID' -> 'Unsubscribe' created double encoded draft subject. - Thunderbird could crash on startup. - Thunderbird could crash when importing mail. - Opening Website header link in RSS feed incorrectly re-encoded URL parameters.