Format let-else with rustfmt nightly (#5461)

Support for `let…else` formatting was just merged to nightly
(rust-lang/rust#113225). Rerun `cargo fmt` with Rust nightly 2023-07-02
to pick this up. Followup to #939.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

crates/ruff_python_formatter/src/statement/suite.rs

@@ -52,7 +52,7 @@ impl FormatRule<Suite, PyFormatContext<'_>> for FormatSuite {
 
         let mut iter = statements.iter();
         let Some(first) = iter.next() else {
-            return Ok(())
+            return Ok(());
         };
 
         // First entry has never any separator, doesn't matter which one we take;