Update python dependencies

[egrace479]

We should probably reduce support to 3.10+ (3.9 is approaching end of life and 3.8 has been retired). (fix in pyproject.toml)

Then also update pyproject.toml to include classifiers for all supported python versions (this is so it shows up appropriately on PyPI & in badge):
```
classifiers = [
"Programming Language :: Python",
"Programming Language :: Python :: 3.10",
"Programming Language :: Python :: 3.11",
"Programming Language :: Python :: 3.12",
"Programming Language :: Python :: 3.13",
]