add python 3.13 to our test matrices

[jhkennedy]

It's been out for a month and community support is pretty broad -- if I create a new earthaccess env locally, I get python 3.13 now.

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📚 Documentation preview 📚: https://earthaccess--873.org.readthedocs.build/en/873/

[github-actions]

👈 Launch a binder notebook on this branch for commit 701f307

I will automatically update this comment whenever this PR is modified

[chuckwondo]

yay!