C++: Update code scanning suite .expected.

Author: geoffw0

cpp/ql/integration-tests/query-suite/cpp-code-scanning.qls.expected

@@ -40,6 +40,7 @@ ql/cpp/ql/src/Security/CWE/CWE-367/TOCTOUFilesystemRace.ql
 ql/cpp/ql/src/Security/CWE/CWE-416/IteratorToExpiredContainer.ql
 ql/cpp/ql/src/Security/CWE/CWE-416/UseOfStringAfterLifetimeEnds.ql
 ql/cpp/ql/src/Security/CWE/CWE-416/UseOfUniquePointerAfterLifetimeEnds.ql
+ql/cpp/ql/src/Security/CWE/CWE-468/SuspiciousAddWithSizeof.ql
 ql/cpp/ql/src/Security/CWE/CWE-497/ExposedSystemData.ql
 ql/cpp/ql/src/Security/CWE/CWE-611/XXE.ql
 ql/cpp/ql/src/Security/CWE/CWE-676/DangerousFunctionOverflow.ql