patch 8.2.2252: Vim9: crash when using lambda without return type in dict

Problem:    Vim9: crash when using lambda without return type in dict.
Solution:   Without a return type use t_unknown. (closes #7587)
diff --git a/src/version.c b/src/version.c
index f080e68..d1bb9cc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2252,
+/**/
     2251,
 /**/
     2250,