chore: remove 3.13 freethreaded builds #582

Job	Run time
build / lint-rust	20s
build / lint-toml	6s
build / lint-python	12s
build / generate-license	46s
build / check-crates-patch	0s
build / Linux x86_64 (3.14t)	11m 47s
build / Linux arm64 (abi3)	9m 45s
build / Linux arm64 (3.14t)	9m 40s
build / Linux x86_64 (abi3)	15m 33s
build / Windows x86_64 (3.14t)	11m 19s
build / Windows x86_64 (abi3)	11m 25s
build / macOS arm64 (3.14t)	5m 48s
build / macOS arm64 (abi3)	12m 34s
build / Source distribution	0s
build / macOS x86_64 (${{ matrix.python-tag }})	0s
build / Build docs	1m 30s
build / Merge build artifacts	-1s
test / test-matrix (3.10, abi3, false)	3m 48s
test / test-matrix (3.14t, 3.14t, true)	3m 23s
test / test-matrix (3.14, abi3, false)	4m 53s
test / test-matrix (3.11, abi3, false)	3m 50s
test / test-matrix (3.12, abi3, false)	3m 48s
test / test-matrix (3.13, abi3, false)	4m 2s
	1h 54m 28s

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