chore: Fix workflows

Author: sugyan

Diff for: .github/workflows/rust.yml

@@ -41,12 +41,13 @@ jobs:
 
       - name: Compile (rust-analyzer)
         run: cargo build --verbose
-        
+
       - name: Lint (clippy)
         uses: giraffate/clippy-action@v1
         with:
           reporter: "github-pr-check"
           github_token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Format (rustfmt)
+        if: matrix.rust != 'stable'
         run: cargo fmt-no-gen --check