Use Arbitrary Self Types instead of Py<Type>Methods traits #12457

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5 errors

`cargo clippy --no-default-features --all-targets --workspace -- --deny=warnings` failed

`cargo clippy --no-default-features --features=abi3 --all-targets --workspace -- --deny=warnings` failed

`cargo clippy --features=full,multiple-pymethods,jiff-01 --all-targets --workspace -- --deny=warnings` failed

`cargo clippy --features=abi3,full,multiple-pymethods,jiff-01 --all-targets --workspace -- --deny=warnings` failed

Process completed with exit code 1.