patch 8.2.2791: Vim9: memory leak when using \=expr in :substitute

Problem:    Vim9: memory leak when using \=expr in :substitute.
Solution:   Do not allocate a new instruction list.
diff --git a/src/version.c b/src/version.c
index 539d7d5..fa2dfae 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2791,
+/**/
     2790,
 /**/
     2789,