gh-104773: PEP 594: Remove the uu module

[vstinner]

Doc/license.rst: Keep the UUencode and UUdecode license since it's also used by the uu codec.

• Issue: PEP 594: Remove stdlib modules scheduled for deletion in Python 3.13 #104773

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📚 Documentation preview 📚: https://cpython-previews--104932.org.readthedocs.build/

[vstinner]

I will write a separated PR to deprecate:

• binascii.b2a_uu() and binascii.a2b_uu() functions
• the uu codec

PEP 594 mentions them, but we forgot to deprecate them in Python 3.11.

[hugovk]

I will write a separated PR to deprecate: [...]

There's already a PR that does at least some of this: #92758. Would you like to review it?