patch 8.2.3346: Vim9: no error for using "." for concatenation after ":vim9cmd"

Problem:    Vim9: no error for using "." for concatenation after ":vim9cmd".
            (Naohiro Ono)
Solution:   Check for Vim9 script syntax. (closes #8756)
diff --git a/src/version.c b/src/version.c
index b649014..a2a229b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3346,
+/**/
     3345,
 /**/
     3344,