Relax orderings of Serialize impl for atomic types to match the latest stable

[taiki-e]

The standard library changed orderings of Debug impl for atomic types from SeqCst to Relaxed in Rust 1.63 (latest stable): rust-lang/rust#97026

This PR relaxes the orderings of Serialize impl for atomic types to match the latest stable.

serde/serde/src/ser/impls.rs

Lines 918 to 919 in ebd06ee

	// Matches the atomic ordering used in libcore for the Debug impl
	self.load(Ordering::SeqCst).serialize(serializer)

[dtolnay]

Thanks!

[Mingun]

Shouldn't this be dependent on the current rust version?

[71]

@Mingun My understanding is that the reasoning for the change also applies here, ie. this change does not intend to replicate how Debug behaves, but rather applies the reasoning that Debug can use relaxed ordering to Serialize, since Debug and Serialize behave similarly.