Use the new bound API instead of .as_ref(py)

[LilyFoote]

I was looking into the step of marking Py::as_ref as deprecated and while there's still some blockers, I was able to update to use the new api in a bunch of places.

[codspeed-hq]

CodSpeed Performance Report

Merging #3853 will degrade performances by 16.65%

_{Comparing LilyFoote:replace-as-ref-with-bind (1a98cbd) with main (c33d330)}

🎉 Hooray! codspeed-rust just leveled up to 2.3.3!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability 🥳!
Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

Summary

⚡ 2 improvements
❌ 2 regressions
✅ 75 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	LilyFoote:replace-as-ref-with-bind	Change
⚡	mapping_from_dict	355.6 ns	300 ns	+18.52%
❌	extract_float_downcast_success	425.6 ns	508.9 ns	-16.38%
❌	extract_float_extract_success	417.2 ns	500.6 ns	-16.65%
⚡	sequence_from_list	355.6 ns	300 ns	+18.52%

[Icxolu]

Looks good to me! I marked a few spots, where I think we can relax lifetime constraints.

[davidhewitt]

Nice to clean these up, thanks! Just a few small thoughts... 👍

[Icxolu]

Nice tidy up, LGTM 🚀

[davidhewitt]

Great, thanks! 🚀