fix fallout from rust-lang/rust#119820

[lcnr]

See the added comment for background. This change is necessary to avoid breaking downstream users once rust-lang/rust#119820 lands. While the exact impact is uncertain, we know https://github.com/grego/blades to be affected.

Please ask for clarification if you would like further information. It is likely desirable to remove the parameter S from Ramhorms::get, always requiring str. This would require a new major version however. I apologize for the inconvenience.

[maciejhirsz]

Thanks for bringing this up! I'll go ahead with your suggestion and just require &str, it seems more idiomatic and less hacky of a solution to me.

Ramhorns can use a 1.0 release since it's been quite stable for a long time.