identify not working with mpl 3.8

[zmoon]

Warning
tams.identify not working with Matplotlib 3.8.

The format of ContourSet.allsegs has changed. It seems there is now just one (path) array for all of the contours of a certain level (instead of a list containing an array for each contour). The recommendation appears to be to use .get_paths(). This has the codes as well, which we could use to extract the coordinates for each contour (like in modflowpy/flopy#1951). Or we could try to move to direct ContourPy usage.

Note

The current method should work in 3.8.1 (the previous behavior was restored), just have to avoid 3.8.0.

[zmoon]

I think for now (this issue) we should just add relevant info about this to the docs section, and we can investigate using ContourPy later.