Add Python 3.12 support

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (3674369) 88.21% compared to head (8026194) 88.00%.

Files	Patch %	Lines
dwave/inspector/viewers.py	60.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #167 +/- ## ========================================== - Coverage 88.21% 88.00% -0.21% ========================================== Files 8 8 Lines 789 792 +3 ========================================== + Hits 696 697 +1 - Misses 93 95 +2 ```

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