bump the rust toolchain to 1.83.0 (#15148)

# Description

This PR bumps the rust toolchain to 1.83.0 and fixes a clippy lint. We
do this because Rust 1.85.0 was released today, and we try and stay 2
versions behind.

# User-Facing Changes
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helps us keep track of breaking changes. -->

# Tests + Formatting
<!--
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Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
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crates/nu-command/src/filesystem/cd.rs

@@ -77,7 +77,9 @@ impl Command for Cd {
                         if let Ok(path) = nu_path::canonicalize_with(path_no_whitespace, &cwd) {
                             if !path.is_dir() {
                                 return Err(shell_error::io::IoError::new(
-                                    shell_error::io::ErrorKind::NotADirectory,
+                                    shell_error::io::ErrorKind::Std(
+                                        std::io::ErrorKind::NotADirectory,
+                                    ),
                                     v.span,
                                     None,
                                 )
@@ -104,7 +106,7 @@ impl Command for Cd {
                         };
                         if !path.is_dir() {
                             return Err(shell_error::io::IoError::new(
-                                shell_error::io::ErrorKind::NotADirectory,
+                                shell_error::io::ErrorKind::Std(std::io::ErrorKind::NotADirectory),
                                 v.span,
                                 path,
                             )

crates/nu-command/src/filesystem/open.rs

@@ -151,7 +151,7 @@ impl Command for Open {
                         // At least under windows this check ensures that we don't get a
                         // permission denied error on directories
                         return Err(ShellError::Io(IoError::new(
-                            shell_error::io::ErrorKind::IsADirectory,
+                            shell_error::io::ErrorKind::Std(std::io::ErrorKind::IsADirectory),
                             arg_span,
                             PathBuf::from(path),
                         )));

crates/nu-command/src/filesystem/save.rs

@@ -424,7 +424,9 @@ fn open_file(path: &Path, span: Span, append: bool) -> Result<File, ShellError>
             // A TOCTOU problem exists here, which may cause wrong error message to be shown
             #[cfg(target_os = "windows")]
             if path.is_dir() {
-                Err(nu_protocol::shell_error::io::ErrorKind::IsADirectory)
+                Err(nu_protocol::shell_error::io::ErrorKind::Std(
+                    std::io::ErrorKind::IsADirectory,
+                ))
             } else {
                 std::fs::File::create(path).map_err(|err| err.kind().into())
             }