patch 8.2.0321: Vim9: ":execute" does not work yet

Problem:    Vim9: ":execute" does not work yet.
Solution:   Add ISN_EXECUTE. (closes #5699) Also make :echo work with more
            than one argument.
diff --git a/src/version.c b/src/version.c
index 46540e9..beceb6d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    321,
+/**/
     320,
 /**/
     319,