gh-145192: Improve performance of PySequence_GetSlice #2298

Job	Run time
x86_64-unknown-linux-gnu/gcc-free-threading	8m 31s
aarch64-unknown-linux-gnu/gcc	6m 57s
aarch64-apple-darwin/clang	10m 4s
x86_64-apple-darwin/clang	13m 30s
x86_64-unknown-linux-gnu/gcc	9m 48s
x86_64-pc-windows-msvc/msvc	9m 38s
x86_64-pc-windows-msvc/msvc-free-threading	4m 29s
	1h 2m 57s

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