patch 8.2.2946: Vim9: substitute expression cannot be a List

Problem:    Vim9: substitute expression cannot be a List in a :def function.
Solution:   Use typval2string(). (closes #8330)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2946,
 /**/
     2945,
 /**/