patch 8.2.3126: Vim9: for loop error reports wrong line number

Problem:    Vim9: for loop error reports wrong line number.
Solution:   Save and restore the line number when evaluating the expression.
            (closes #8514)

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3126,
 /**/
     3125,
 /**/