patch 8.2.2088: Vim9: script test sometimes fails

Problem:    Vim9: script test sometimes fails.
Solution:   Unlet variables.
diff --git a/src/version.c b/src/version.c
index 3517510..36aa840 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2088,
+/**/
     2087,
 /**/
     2086,