Add note about free threading wheel variants. #208

Job	Run time
Test (windows-latest, 3.8)	3m 3s
Test (ubuntu-20.04, 3.8)	31s
Test (windows-latest, 3.9)	1m 24s
Test (ubuntu-20.04, 3.9)	32s
Test (windows-latest, 3.10)	2m 1s
Test (ubuntu-20.04, 3.10)	33s
Test (windows-latest, 3.11)	1m 31s
Test (ubuntu-20.04, 3.11)	31s
Test - NO GIL (ubuntu-20.04, 3.13-dev)	1m 6s
Test (macos-latest, 3.8)	1m 8s
Test (windows-latest, 3.12)	1m 43s
Test (ubuntu-20.04, 3.12)	43s
Test (macos-latest, 3.9)	34s
Test (windows-latest, 3.13-dev)	2m 21s
Test (ubuntu-20.04, 3.13-dev)	52s
Test (macos-latest, 3.10)	24s
Test (windows-latest, pypy-3.8)	1m 48s
Test (ubuntu-20.04, pypy-3.8)	41s
Test (macos-latest, 3.11)	25s
Test (windows-latest, pypy-3.9)	1m 13s
Test (ubuntu-20.04, pypy-3.9)	40s
Test (macos-latest, 3.12)	37s
Test (windows-latest, pypy-3.10)	1m 24s
Test (ubuntu-20.04, pypy-3.10)	43s
Test (macos-latest, 3.13-dev)	54s
Test (macos-latest, pypy-3.8)	38s
Test (macos-latest, pypy-3.9)	38s
Test (macos-latest, pypy-3.10)	37s
Build source distribution	8s
Build wheels (3.8+) on ubuntu-20.04 for auto	3m 56s
Build wheels (3.8+) on windows-latest for auto	6m 4s
Build wheels (3.8+) on macos-latest for auto	2m 42s
Build wheels (3.8+) on ubuntu-20.04 for aarch64	9m 22s
Build wheels (3.8+) on macos-latest for arm64	3m 31s
	54m 58s

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