patch 8.2.4141: Vim9 builtin functions test fails

Problem:    Vim9 builtin functions test fails.
Solution:   Add "scriptversion" item to maparg() result.

src/testdir/test_vim9_builtin.vim

@@ -2278,6 +2278,7 @@ def Test_maparg()
         nowait: 0,
         expr: 0,
         sid: SID(),
+        scriptversion: 999999,
         rhs: 'bar',
         buffer: 0})
   unmap foo

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4141,
 /**/
     4140,
 /**/