gh-145376: Fix refleaks and double decref for code in Python/ #2328

Job	Run time
x86_64-pc-windows-msvc/msvc-free-threading	5m 33s
aarch64-unknown-linux-gnu/gcc	7m 11s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 38s
aarch64-apple-darwin/clang	8m 29s
x86_64-pc-windows-msvc/msvc	10m 6s
x86_64-unknown-linux-gnu/gcc	10m 3s
x86_64-apple-darwin/clang	15m 3s
	1h 5m 3s

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