`str::as_bytes` and friends have incorrect const stabilization version annotation

[tbu-]

rust/library/core/src/str/mod.rs

Line 220 in 8e54a21

#[rustc_const_stable(feature = "str_as_bytes", since = "1.32.0")]

These were stabilized in 7767e7f as part of #63770 which was only included in 1.39.0 and up (GitHub displays this in the commit link).

The attribute was added in 5e17e39 as part of #67136, one could presumably check the other version attributes as well.

Affects:

• str::as_bytes
• str::is_empty
• str::len

[m-ou-se]

cc @oli-obk

[oli-obk]

I just copy pasted these everywhere and forgot to check the versions on some of these. I guess I'll have to go through all of them to find out which ones I missed.