old cppcheck used in CI

[jmayclin]

Problem:

We currently run cppcheck 2.3 in CI. The current release is 2.13. This means we are using a version of cppcheck that is approximately three years old.

Solution:

A number of new checks and suggestions have been added, so this will not be straightforward to add to our codebase.

Requirements / Acceptance Criteria:

• upgrade to a recent cppcheck, either 2.12 or 2.13.