Revert "Update CI auto-format (RustPython#6233)" (RustPython#6236)

This reverts commit 377151a.

Author: YashSuthar983

.github/workflows/auto-format.yaml

@@ -307,13 +307,15 @@ jobs:
         run: python -I whats_left.py
 
   lint:
-    name: Check Rust code with clippy
+    name: Check Rust code with rustfmt and clippy
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
       - uses: dtolnay/rust-toolchain@stable
         with:
-            components: clippy
+            components: rustfmt, clippy
+      - name: run rustfmt
+        run: cargo fmt --check
       - name: run clippy on wasm
         run: cargo clippy --manifest-path=wasm/lib/Cargo.toml -- -Dwarnings
       - uses: actions/setup-python@v6