CI: set `allow-prereleases: true` #676

Job	Run time
windows-2022 - 3.8	3m 20s
ubuntu-latest - 3.8	38s
windows-2022 - 3.9	3m 46s
ubuntu-latest - 3.9	41s
windows-2022 - 3.10	4m 2s
ubuntu-latest - 3.10	38s
windows-2022 - 3.11	3m 6s
ubuntu-latest - 3.11	47s
windows-2022 - 3.12	4m 38s
ubuntu-latest - 3.12	1m 14s
macos-latest - 3.8	1m 25s
macos-latest - 3.9	1m 28s
macos-latest - 3.10	1m 26s
macos-latest - 3.11	1m 33s
macos-latest - 3.12	2m 30s
Mac and Linux Test Successful	0s
Windows Test Successful	0s
	31m 12s

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