Restore AsyncResolver to be the default resolver #3857

Job	Run time
Generate llhttp sources	6s
Linter	58s
Test (3.8, ubuntu, false)	5m 48s
Test (3.8, windows, false)	5m 57s
Test (3.8, Y, ubuntu, false)	4m 44s
Test (3.9, ubuntu, false)	4m 46s
Test (3.9, macos, false)	3m 45s
Test (3.9, windows, false)	5m 21s
Test (3.9, Y, ubuntu, false)	4m 57s
Test (3.10, ubuntu, false)	5m 36s
Test (3.10, macos, false)	3m 48s
Test (3.10, windows, false)	8m 30s
Test (3.10, Y, ubuntu, false)	4m 38s
Test (3.11, ubuntu, false)	5m 15s
Test (3.11, macos, false)	4m 21s
Test (3.11, windows, false)	8m 51s
Test (3.11, Y, ubuntu, false)	4m 9s
Test (3.12, ubuntu, false)	5m 10s
Test (3.12, macos, false)	3m 47s
Test (3.12, windows, false)	8m 35s
Test (3.12, Y, ubuntu, false)	5m 38s
Test (pypy-3.9, Y, ubuntu, false)	10m 59s
Test (ubuntu, 3.13, true, Y)	44s
check	3s
Pre-Deploy	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Tarball	0s
Deploy	0s
	1h 56m 26s

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