patch 8.2.1311: test failures with legacy Vim script

Problem:    Test failures with legacy Vim script.
Solution:   Actually check for Vim9 script.
diff --git a/src/version.c b/src/version.c
index d8dfba8..93da0a8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1311,
+/**/
     1310,
 /**/
     1309,