avoid reference count cycle in tuple extraction #9099

Job	Run time
fmt	19s
check-msrv	11m 20s
semver-checks	27s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
careful	0s
coverage-windows	5s
coverage-macos	6s
clippy/x86_64-apple-darwin/stable	19m 25s
coverage-ubuntu	15m 33s
test-debug	11m 22s
clippy/x86_64-unknown-linux-gnu/stable	13m 45s
docsrs	0s
clippy/powerpc64le-unknown-linux-gnu/stable	13m 28s
clippy/s390x-unknown-linux-gnu/stable	13m 13s
valgrind	0s
clippy/wasm32-wasi/stable	12m 48s
clippy/x86_64-pc-windows-msvc/stable	18m 26s
clippy/i686-pc-windows-msvc/stable	17m 51s
clippy/x86_64-unknown-linux-gnu/beta	11m 47s
check-feature-powerset	0s
emscripten	0s
test-version-limits	0s
test-cross-compilation ${{ matrix.os }} -> ${{ matrix.target }}	0s
test-cross-compilation-windows	0s
python3.12-x64 windows-latest rust-stable / build	10m 56s
python3.12-x86 windows-latest rust-stable / build	9m 56s
python3.12-x64 ubuntu-latest rust-stable / build	7m 20s
python3.12-x64 macos-latest rust-stable / build	8m 34s
python3.12-x64 ubuntu-latest rust-nightly / build	7m 21s
conclusion	1s
	3h 24m 3s

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