#305 - Relax version constraints on itertools

[reckart]

• Relax the version
• Add refactoring issue template

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.16%. Comparing base (49a66ee) to head (d329ff5).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #306 +/- ## ======================================= Coverage 95.16% 95.16% ======================================= Files 5 5 Lines 1987 1987 ======================================= Hits 1891 1891 Misses 96 96 ```

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