gh-145192: Improve performance of PySequence_GetSlice #3058

Job	Run time
x86_64-unknown-linux-gnu/gcc-free-threading	8m 37s
aarch64-apple-darwin/clang	8m 44s
aarch64-unknown-linux-gnu/gcc	6m 55s
x86_64-unknown-linux-gnu/gcc	10m 23s
x86_64-apple-darwin/clang	15m 42s
	50m 21s

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