if (version check) + elif (version check) is not rewritten!

[asottile]

in --py38-plus mode I expect:

-    if sys.version_info < (3, 8):  # pragma: <3.8 cover
-        msg = "SyntaxError: can't assign to function call (<unknown>, line 1)"
-    elif sys.version_info < (3, 10):  # pragma: no cover
+    if sys.version_info < (3, 10):  # pragma: no cover
         msg = "SyntaxError: cannot assign to function call (<unknown>, line 1)"
     else:  # pragma: >=3.10 cover
         msg = (
             "SyntaxError: cannot assign to function call here. "
             "Maybe you meant '==' instead of '='? (<unknown>, line 1)"
         )