patch 8.2.0488: Vim9: compiling can break when using a lambda inside :def

Problem:    Vim9: Compiling can break when using a lambda inside :def.
Solution:   Do not keep a pointer to the dfunc_T for longer time.
diff --git a/src/version.c b/src/version.c
index 549bf3b..58180ac 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    488,
+/**/
     487,
 /**/
     486,