CLSA-2026-1777543457 webkit2gtk3: Fix of 9 CVEs

Update to 2.50.6 to fix the following vulnerabilities WSA-2026-0001: - CVE-2025-43213: type confusion in JavaScriptCore fixed in 2.50.5 - CVE-2025-43214: out-of-bounds read in WebCore fixed in 2.50.5 - CVE-2025-43457: integer overflow in WebKit canvas rendering fixed in 2.50.6 - CVE-2025-43511:...