Merge pull request github#7732 from MathiasVP/security-severity-for-return-stack-allocated-memory

C++: Add security-severity to `cpp/return-stack-allocated-memory`

Author: geoffw0

cpp/ql/src/Likely Bugs/Memory Management/ReturnStackAllocatedMemory.ql

@@ -6,6 +6,7 @@
  * @kind path-problem
  * @id cpp/return-stack-allocated-memory
  * @problem.severity warning
+ * @security-severity 9.3
  * @precision high
  * @tags reliability
  *       security