gh-118561: Fix crash involving list.extend in free-threaded build #86

Job	Run time
i686-pc-windows-msvc/msvc (Debug)	22m 6s
i686-pc-windows-msvc/msvc (Release)	27m 4s
x86_64-pc-windows-msvc/msvc (Debug)	22m 1s
x86_64-pc-windows-msvc/msvc (Release)	26m 44s
aarch64-pc-windows-msvc/msvc (Debug)	5m 24s
aarch64-pc-windows-msvc/msvc (Release)	7m 35s
x86_64-apple-darwin/clang (Debug)	11m 49s
x86_64-apple-darwin/clang (Release)	19m 47s
aarch64-apple-darwin/clang (Debug)	11m 59s
aarch64-apple-darwin/clang (Release)	15m 25s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 44s
x86_64-unknown-linux-gnu/gcc (Release)	12m 14s
x86_64-unknown-linux-gnu/clang (Debug)	8m 43s
x86_64-unknown-linux-gnu/clang (Release)	11m 15s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 18m 59s
aarch64-unknown-linux-gnu/gcc (Release)	55m 41s
aarch64-unknown-linux-gnu/clang (Debug)	1h 11m 3s
aarch64-unknown-linux-gnu/clang (Release)	38m 57s
	7h 35m 30s

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