Fix Python 3.12 compatibility

[musicinmybrain]

This method of replacing the deprecated-and-removed imp with importlib seems OK.

[musicinmybrain]

Builds on and includes https://github.com/jonathaneunice/ansiwrap/pull/19.

[medb]

@jonathaneunice may we merge this PR?

[mrakitin]

The corresponding feedstock in conda-forge has a proposed workaround for Python versions<3.12 (https://github.com/conda-forge/ansiwrap-feedstock/pull/3) and there is a corresponding patch in the metadata preventing installing the package for Python 3.12. The release of this fix will solve the issue.

[jaketesler]

@jonathaneunice are you still maintaining this package?

[hakonhagland]

Anything preventing this PR from being merged? I am using python 3.12 and am getting ModuleNotFoundError: No module named 'imp'