Update non-ASCII crate name warning message

Author: BlackHoleFox

src/cargo/ops/cargo_new.rs

@@ -253,8 +253,7 @@ fn check_name(
     if restricted_names::is_non_ascii_name(name) {
         shell.warn(format!(
             "the name `{}` contains non-ASCII characters\n\
-            Support for non-ASCII crate names is experimental and only valid \
-            on the nightly toolchain.",
+            Non-ASCII crate names are not supported by Rust.",
             name
         ))?;
     }

tests/testsuite/new.rs

@@ -435,7 +435,7 @@ fn non_ascii_name() {
         .with_stderr(
             "\
 [WARNING] the name `Привет` contains non-ASCII characters
-Support for non-ASCII crate names is experimental and only valid on the nightly toolchain.
+Non-ASCII crate names are not supported by Rust.
 [CREATED] binary (application) `Привет` package
 ",
         )