Avoid recommending `slots` for classes that inherit from more than `namedtuple` #31055

Job	Run time
mkdocs	2m 15s
Determine changes	9s
cargo fmt	16s
pre-commit	39s
python package	1m 14s
cargo test (linux)	3m 32s
cargo clippy	1m 45s
cargo test (wasm)	1m 9s
cargo test (windows)	8m 41s
cargo build (msrv)	3m 2s
cargo build (release)	4m 27s
cargo fuzz	4m 55s
cargo shear	24s
test scripts	58s
benchmarks	4m 40s
formatter instabilities and black similarity	0s
test ruff-lsp	20s
ecosystem	9m 11s
Fuzz the parser	0s
	47m 37s

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