test: update Python and ZK in testing suite

[StephenSorriaux]

Fixes #708

Why is this needed?

Python 3.7 is EOL since last year, Python 3.11 and Python 3.12 are here now. ZK 3.6 is EOL since end of 2022 and ZK 3.9 is here.

Proposed Changes

• drop Python 3.7 from testing
• add Python 3.11 and 3.12 to testing
• drop ZK 3.4 and 3.5
• add ZK 3.8 and 3.9

Does this PR introduce any breaking change?

No.

[codecov[bot]]

Codecov Report

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

Comparison is base (383cdf8) 96.76% compared to head (1aaabe7) 96.73%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #737 +/- ## ========================================== - Coverage 96.76% 96.73% -0.03% ========================================== Files 27 27 Lines 3557 3557 ========================================== - Hits 3442 3441 -1 - Misses 115 116 +1 ```

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[jeffwidman]

Thanks 🙏