patch 8.2.2597: Vim9: "import * as" does not work at script level

Problem:    Vim9: "import * as" does not work at script level.
Solution:   Implement using an imported namespace.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2597,
 /**/
     2596,
 /**/