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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# Tests + Formatting
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crates/nu-command/tests/commands/database/into_sqlite.rs

@@ -405,7 +405,7 @@ impl From<TestRow> for Value {
     }
 }
 
-impl<'r> TryFrom<&rusqlite::Row<'r>> for TestRow {
+impl TryFrom<&rusqlite::Row<'_>> for TestRow {
     type Error = rusqlite::Error;
 
     fn try_from(row: &rusqlite::Row) -> Result<Self, Self::Error> {

crates/nu-command/tests/commands/rm.rs

@@ -419,7 +419,7 @@ fn set_dir_read_only(directory: &AbsolutePath, read_only: bool) {
 }
 
 #[cfg(not(windows))]
-impl<'a> Drop for Cleanup<'a> {
+impl Drop for Cleanup<'_> {
     /// Restores write permissions to the given directory so that the Playground can be successfully
     /// cleaned up.
     fn drop(&mut self) {