lang/rust: Update to 1.98.1
Announce: https://blog.rust-lang.org/2026/08/20/Rust-1.98.0/
https://blog.rust-lang.org/2026/09/03/Rust-1.98.1/
ChangeLog: https://github.com/rust-lang/rust/releases/tag/1.98.0
https://github.com/rust-lang/rust/releases/tag/1.98.1
PR: 298139
Tested by: mikael,pkubaj