Restore Trio support and test both AnyIO backends #4299

Job	Run time
checks / docs	1m 3s
checks / readme-snippets	12s
checks / test (3.12, locked, windows-latest)	3m 4s
checks / test (3.12, lowest-direct, ubuntu-latest)	2m 17s
checks / test (3.12, lowest-direct, windows-latest)	1m 52s
checks / test (3.11, locked, windows-latest)	3m 2s
checks / test (3.11, locked, ubuntu-latest)	1m 35s
checks / test (3.13, locked, ubuntu-latest)	1m 58s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 37s
checks / test (3.13, lowest-direct, windows-latest)	2m 55s
checks / test (3.12, locked, ubuntu-latest)	2m 36s
checks / test (3.14, lowest-direct, windows-latest)	2m 42s
checks / test (3.10, lowest-direct, windows-latest)	2m 55s
checks / test (3.11, lowest-direct, windows-latest)	3m 13s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 53s
checks / test (3.13, locked, windows-latest)	3m 3s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 56s
checks / test (3.10, locked, ubuntu-latest)	2m 11s
checks / test (3.14, locked, ubuntu-latest)	1m 58s
checks / pre-commit	1m 2s
checks / test (3.14, locked, windows-latest)	2m 33s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 49s
checks / test (3.10, locked, windows-latest)	3m 59s
all-green	4s
	51m 29s

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