Merge pull request github#13610 from MathiasVP/promote-overrun-write-again

C++: Move `cpp/overrun-write` back to `medium` precision

Author: MathiasVP

cpp/ql/src/Security/CWE/CWE-119/OverrunWriteProductFlow.ql

@@ -5,7 +5,7 @@
  * @kind path-problem
  * @problem.severity error
  * @security-severity 9.3
- * @precision low
+ * @precision medium
  * @id cpp/overrun-write
  * @tags reliability
  *       security