gh-145779: Improve classmethod/staticmethod scaling in free-threaded build #2404

Job	Run time
x86_64-unknown-linux-gnu/gcc	9m 55s
aarch64-apple-darwin/clang	9m 27s
x86_64-apple-darwin/clang	15m 30s
x86_64-pc-windows-msvc/msvc-free-threading	5m 25s
x86_64-unknown-linux-gnu/gcc-free-threading	9m 26s
x86_64-pc-windows-msvc/msvc	10m 35s
aarch64-unknown-linux-gnu/gcc	7m 19s
	1h 7m 37s

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