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Remove ubuntu-20.04 from github actions

This is fully unsupported [1], and prevents further tests from running.

[1]: https://github.com/actions/runner-images/issues/11101
Y
Yuxuan 'fishy' Wang committed
7e45f58ad7b6553ecd64c7472d392c31a6e0e2ac
Parent: 0414755
Committed by Yuxuan 'fishy' Wang <fishywang@gmail.com> on 4/17/2025, 4:02:03 PM