scikit-hep / iminuit / 29984453696

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fix: matplotlib >= 3.11 figure reuse in CostSum.visualize (repairs coverage CI) (#1141)

matplotlib 3.11 raises when `plt.subplots(num=...)` is given an existing
figure number. `CostSum.visualize` grabs the current figure with
`plt.gcf()` and then calls `plt.subplots(1, n, num=fig.number)`, hitting
this error:

```
ValueError: Figure 1 already exists. Use plt.figure(1) to get it or plt.close(1)
to close it. Alternatively, pass 'clear=True' to subplots().
```

One line fix. CI has been red (and iminuit has been broken) since June
11.

1 of 1 new or added line in 1 file covered. (100.0%)

3898 of 3913 relevant lines covered (99.62%)

1.0 hits per line