feat(python): add "return" patterns to @indent_end

`return ...` is usually the last line of a
function/statement, so mark some possible patterns of `return` with
`@indent_end` to dedent the line after it

queries/python/indents.scm

@@ -72,6 +72,15 @@
 (list_pattern "]" @indent_end)
 
 
+(return_statement
+  [
+    (_) @indent_end 
+    (_ (_) @indent_end .)
+    (attribute 
+      attribute: (_) @indent_end)
+    "return" @indent_end
+  ] .)
+
 [
   ")"
   "]"