patch 8.2.2179: Vim9: crash when indexing a dict with a number

Problem:    Vim9: crash when indexing a dict with a number.
Solution:   Add ISN_STOREINDEX. (closes #7513)
diff --git a/src/errors.h b/src/errors.h
index 023c1d1..a74da2c 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -323,3 +323,7 @@
 	INIT(= N_("E1145: Missing heredoc end marker: %s"));
 EXTERN char e_command_not_recognized_str[]
 	INIT(= N_("E1146: Command not recognized: %s"));
+EXTERN char e_list_not_set[]
+	INIT(= N_("E1147: List not set"));
+EXTERN char e_cannot_index_str[]
+	INIT(= N_("E1148: Cannot index a %s"));