CLSA-2025-1765986482 webkit2gtk3: Fix of 4 CVEs

CVE-2025-13502: fix out of bounds read and integer underflow by adding bounds checking and validating message delimiters - CVE-2025-43430: fix bbq jit compiler writing to wrong stack slots in wasm try/catch blocks - CVE-2025-43421: fix memory handling issues that cause unexpected process crashes...