Josh Stone d97bf418d9 test(msrv): use a far future "newer" version
Two tests were using `.rust_version("1.90.0")` for a "newer" Rust, but
this failed in rust-lang/rust#142792 for the start of the *real* 1.90.0.
Let's bump that to 1.999.0 so we won't have to deal with it for a while.
2025-06-22 12:05:40 -07:00
..