patch 8.2.2566: Vim9: Function name is not recognized

Problem:    Vim9: Function name is not recognized.
Solution:   Change lookup_scriptvar() to also find function names.
            (closes #7770)
diff --git a/src/version.c b/src/version.c
index eecbf20..c6913d6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2566,
+/**/
     2565,
 /**/
     2564,