patch 8.2.2554: Vim9: exporting a final is not tested

Problem:    Vim9: exporting a final is not tested.
Solution:   Add a test.
diff --git a/src/version.c b/src/version.c
index eece321..6f05f36 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2554,
+/**/
     2553,
 /**/
     2552,