patch 8.2.2503: Vim9: a caught error may leave something on the stack

Problem:    Vim9: a caught error may leave something on the stack.
Solution:   Drop items from the stack if needed. (closes #7826)
diff --git a/src/version.c b/src/version.c
index ac9087a..60f8a71 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2503,
+/**/
     2502,
 /**/
     2501,