C++: lower the precision of cpp/overrun-write to exclude it from our query suites

Author: jketema

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

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