always use a Python iterator for sets and frozensets #8493

Job	Run time
fmt	10s
emscripten	0s
semver-checks	24s
check-msrv	8m 34s
coverage-windows	3s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
coverage-macos	7s
coverage-ubuntu	10m 57s
clippy/x86_64-apple-darwin/stable	11m 58s
test-debug	8m 54s
clippy/x86_64-unknown-linux-gnu/stable	9m 35s
valgrind	0s
clippy/powerpc64le-unknown-linux-gnu/stable	8m 59s
clippy/s390x-unknown-linux-gnu/stable	9m 23s
careful	0s
clippy/wasm32-wasi/stable	9m 0s
docsrs	0s
clippy/x86_64-pc-windows-msvc/stable	13m 38s
clippy/i686-pc-windows-msvc/stable	12m 45s
clippy/x86_64-unknown-linux-gnu/beta	10m 6s
test-version-limits	0s
python3.12-x64 ubuntu-latest rust-stable / build	7m 0s
python3.12-x64 windows-latest rust-stable / build	12m 4s
python3.12-x86 windows-latest rust-stable / build	9m 8s
python3.12-x64 macos-latest rust-stable / build	8m 16s
python3.12-x64 ubuntu-latest rust-nightly / build	1m 29s
conclusion	1s
	2h 32m 31s

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