Cargo.toml: Updated Rust edition from "2021" to "2024"

Also added `edition = "2024"` to `.rustfmt.toml`.

Author: pasabanov

.rustfmt.toml

@@ -1,2 +1,3 @@
+edition = "2024"
 hard_tabs = true
 newline_style = "Unix"

Cargo.toml

@@ -2,7 +2,7 @@
 name = "locale-match"
 version = "0.2.3"
 authors = ["Petr Aleksandrovich Sabanov <pasabanov@murena.io>"]
-edition = "2021"
+edition = "2024"
 description = "A small library for selecting the best match for user's preferred locales from available locales."
 repository = "https://github.com/pasabanov/locale-match"
 license = "LGPL-3.0-or-later"