Add free-threaded Python to the CI #6223

Job	Run time
Build, rustfmt, and python lint	2m 8s
python3.10-arm64 macOS-14	2m 40s
python3.11-x64 macos-15-intel	5m 47s
python3.10-x64 macos-15-intel	4m 34s
python3.12-x64 macos-15-intel	5m 20s
python3.10-x64 ubuntu-latest	2m 55s
python3.10-x64 windows-latest	5m 45s
python3.11-x64 ubuntu-latest	2m 38s
python3.12-x64 ubuntu-latest	2m 49s
python3.11-arm64 macOS-14	2m 38s
python3.12-arm64 macOS-14	2m 49s
python3.11-x64 windows-latest	5m 7s
python3.12-x64 windows-latest	5m 38s
python3.12-arm64 ubuntu-24.04-arm	3m 9s
python3.10-arm64 ubuntu-24.04-arm	3m 3s
python3.14-x64 ubuntu-latest	2m 48s
python3.14t-x64 ubuntu-latest Free-Threaded	3m 4s
python3.14-x64 macos-15-intel	5m 8s
python3.13-arm64 macOS-14	2m 45s
python3.13-x64 macos-15-intel	6m 25s
python3.11-arm64 ubuntu-24.04-arm	3m 0s
python3.14-arm64 ubuntu-24.04-arm	3m 4s
python3.13-x64 ubuntu-latest	2m 57s
python3.13-arm64 ubuntu-24.04-arm	3m 3s
python3.14-x64 ubuntu-latest Beta	2m 49s
python3.14-x64 windows-latest	7m 55s
python3.14t-arm64 macOS-14 Free-Threaded	3m 30s
python3.14-arm64 macOS-14	3m 39s
python3.12-x64 ubuntu-latest MSRV	2m 54s
python3.13-x64 windows-latest	5m 18s
Build Docs	8m 9s
Coverage	2m 37s
python-stubs-3.12	2m 44s
python-stubs-3.10	2m 36s
python-stubs-3.13	2m 36s
python-stubs-3.14	3m 8s
python-stubs-3.11	2m 39s
	2h 19m 48s

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