gh-148263: Fix refcount leak in weakref proxy operations #2796

Job	Run time
x86_64-apple-darwin/clang	15m 7s
aarch64-apple-darwin/clang	11m 34s
x86_64-unknown-linux-gnu/gcc	9m 36s
aarch64-unknown-linux-gnu/gcc	7m 44s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 22s
	52m 23s

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