Loosen req on pint to include 0.23 (newest)

[francescalb]

Description

Type of change

• [ ] Bug fix and code cleanup
• [ ] New feature
• [ ] Documentation update
• [ ] Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• [ ] Is the change limited to one issue?
• [ ] Does this PR close the issue?
• [ ] Is the code easy to read and understand?
• [ ] Do all new feature have an accompanying new test?
• [ ] Has the documentation been updated as necessary?
• [ ] Is the code properly tested?

[codecov[bot]]

Codecov Report

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

Project coverage is 77.58%. Comparing base (6a11a4a) to head (9de8578).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #198 +/- ## ======================================= Coverage 77.58% 77.58% ======================================= Files 18 18 Lines 1548 1548 ======================================= Hits 1201 1201 Misses 347 347 ```

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