Add Python 3.13 to the default interpreter universe #20851
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This adds Python 3.13 to the default interpreter universe, so that we're more ready to hit the ground running when it is eventually released.
https://peps.python.org/pep-0719/ suggests the plan is 3.13.0 stable release on 2024-10-01. This PR will flow into Pants 2.22.0. We won't be releasing 2.22.0 before 2024-07-09 (12 weeks after 2.20.0, on 2024-04-16), so there's a bit of slack even if 2.21 and 2.22 take longer than 6 weeks to get out the door.
It looks like we won't be perfectly ready, because there's a similar lockfile issue to #20354 for Python 3.12: our lockfiles use pip 24.0 which apparently doesn't support Python 3.13 (needs pypa/pip#12462). Thus, we'll need to regenerate our lockfiles once there's a pex release with a pip release with pypa/pip#12462. I've filed #20852 to track this.