patch 8.2.2209: Vim9: return type of => lambda not parsed

Problem:    Vim9: return type of => lambda not parsed.
Solution:   Parse and use the return type.
diff --git a/src/version.c b/src/version.c
index 50acca1..ba291af 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2209,
+/**/
     2208,
 /**/
     2207,