fix: multiple assignments within one statement can be made

Author: jvllmr

src/unparser.rs

@@ -354,7 +354,7 @@ impl Unparser {
             });
 
             if targets_iter.peek().is_some() {
-                self.write_str(", ");
+                self.write_str(" = ");
             }
         }
         self.write_str(" = ");

test_files/assign.py

@@ -0,0 +1,6 @@
+simple_assign = str()
+x1, x2 = (1, 2)
+first = second = "third"
+name_1, name_4, name_2, name_4, name_3 = name_2 = [name_0] = name_0.name_4 = (
+    name_5.name_2  # type: ignore[name-defined, has-type] # noqa
+) = () = {name_5: name_1, name_0: name_3}  # type: ignore[name-defined, has-type] # noqa